Prepara versao dev 1.0

2025-12-08 21:47:38 -03:00
parent 512287698e
commit 190fde20c3
85 changed files with 7755 additions and 2317 deletions
--- a/backend/internal/api/handlers/agency.go
+++ b/backend/internal/api/handlers/agency.go
@@ -0,0 +1,192 @@
+package handlers
+
+import (
+	"encoding/json"
+	"errors"
+	"log"
+	"net/http"
+	"strings"
+	"time"
+
+	"aggios-app/backend/internal/config"
+	"aggios-app/backend/internal/domain"
+	"aggios-app/backend/internal/service"
+
+	"github.com/golang-jwt/jwt/v5"
+	"github.com/google/uuid"
+)
+
+// AgencyRegistrationHandler handles agency management endpoints
+type AgencyRegistrationHandler struct {
+	agencyService *service.AgencyService
+	cfg           *config.Config
+}
+
+// NewAgencyRegistrationHandler creates a new agency registration handler
+func NewAgencyRegistrationHandler(agencyService *service.AgencyService, cfg *config.Config) *AgencyRegistrationHandler {
+	return &AgencyRegistrationHandler{
+		agencyService: agencyService,
+		cfg:           cfg,
+	}
+}
+
+// RegisterAgency handles agency registration (SUPERADMIN only)
+func (h *AgencyRegistrationHandler) RegisterAgency(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	var req domain.RegisterAgencyRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		log.Printf("❌ Error decoding request: %v", err)
+		http.Error(w, "Invalid request body", http.StatusBadRequest)
+		return
+	}
+
+	log.Printf("📥 Registering agency: %s (subdomain: %s)", req.AgencyName, req.Subdomain)
+
+	tenant, admin, err := h.agencyService.RegisterAgency(req)
+	if err != nil {
+		log.Printf("❌ Error registering agency: %v", err)
+		switch err {
+		case service.ErrSubdomainTaken:
+			http.Error(w, err.Error(), http.StatusConflict)
+		case service.ErrEmailAlreadyExists:
+			http.Error(w, err.Error(), http.StatusConflict)
+		case service.ErrWeakPassword:
+			http.Error(w, err.Error(), http.StatusBadRequest)
+		default:
+			http.Error(w, "Internal server error", http.StatusInternalServerError)
+		}
+		return
+	}
+
+	log.Printf("✅ Agency created: %s (ID: %s)", tenant.Name, tenant.ID)
+
+	// Generate JWT token for the new admin
+	claims := jwt.MapClaims{
+		"user_id":   admin.ID.String(),
+		"email":     admin.Email,
+		"role":      admin.Role,
+		"tenant_id": tenant.ID.String(),
+		"exp":       time.Now().Add(time.Hour * 24 * 7).Unix(), // 7 days
+		"iat":       time.Now().Unix(),
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	tokenString, err := token.SignedString([]byte(h.cfg.JWT.Secret))
+	if err != nil {
+		http.Error(w, "Failed to generate token", http.StatusInternalServerError)
+		return
+	}
+
+	protocol := "http://"
+	if h.cfg.App.Environment == "production" {
+		protocol = "https://"
+	}
+
+	response := map[string]interface{}{
+		"token":      tokenString,
+		"id":         admin.ID,
+		"email":      admin.Email,
+		"name":       admin.Name,
+		"role":       admin.Role,
+		"tenantId":   tenant.ID,
+		"company":    tenant.Name,
+		"subdomain":  tenant.Subdomain,
+		"message":    "Agency registered successfully",
+		"access_url": protocol + tenant.Domain,
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusCreated)
+	json.NewEncoder(w).Encode(response)
+}
+
+// RegisterClient handles client registration (ADMIN_AGENCIA only)
+func (h *AgencyRegistrationHandler) RegisterClient(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	// TODO: Get tenant_id from authenticated user context
+	// For now, this would need the auth middleware to set it
+
+	var req domain.RegisterClientRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		http.Error(w, "Invalid request body", http.StatusBadRequest)
+		return
+	}
+
+	// Get tenantID from context (set by middleware)
+	tenantIDStr := r.Header.Get("X-Tenant-ID")
+	if tenantIDStr == "" {
+		http.Error(w, "Tenant not found", http.StatusBadRequest)
+		return
+	}
+
+	// Parse tenant ID
+	// tenantID, _ := uuid.Parse(tenantIDStr)
+
+	// client, err := h.agencyService.RegisterClient(req, tenantID)
+	// ... handle response
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusCreated)
+	json.NewEncoder(w).Encode(map[string]string{
+		"message": "Client registration endpoint - implementation pending",
+	})
+}
+
+// HandleAgency supports GET (details) and DELETE operations for a specific agency
+func (h *AgencyRegistrationHandler) HandleAgency(w http.ResponseWriter, r *http.Request) {
+	if r.URL.Path == "/api/admin/agencies/" {
+		http.Error(w, "Agency ID required", http.StatusBadRequest)
+		return
+	}
+
+	agencyID := strings.TrimPrefix(r.URL.Path, "/api/admin/agencies/")
+	if agencyID == "" || agencyID == r.URL.Path {
+		http.NotFound(w, r)
+		return
+	}
+
+	id, err := uuid.Parse(agencyID)
+	if err != nil {
+		http.Error(w, "Invalid agency ID", http.StatusBadRequest)
+		return
+	}
+
+	switch r.Method {
+	case http.MethodGet:
+		details, err := h.agencyService.GetAgencyDetails(id)
+		if err != nil {
+			if errors.Is(err, service.ErrTenantNotFound) {
+				http.Error(w, "Agency not found", http.StatusNotFound)
+				return
+			}
+			http.Error(w, "Internal server error", http.StatusInternalServerError)
+			return
+		}
+
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(details)
+
+	case http.MethodDelete:
+		if err := h.agencyService.DeleteAgency(id); err != nil {
+			if errors.Is(err, service.ErrTenantNotFound) {
+				http.Error(w, "Agency not found", http.StatusNotFound)
+				return
+			}
+			http.Error(w, "Internal server error", http.StatusInternalServerError)
+			return
+		}
+
+		w.WriteHeader(http.StatusNoContent)
+
+	default:
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+	}
+}
--- a/backend/internal/api/handlers/agency_profile.go
+++ b/backend/internal/api/handlers/agency_profile.go
@@ -0,0 +1,179 @@
+package handlers
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"aggios-app/backend/internal/repository"
+
+	"github.com/google/uuid"
+)
+
+type AgencyHandler struct {
+	tenantRepo *repository.TenantRepository
+}
+
+func NewAgencyHandler(tenantRepo *repository.TenantRepository) *AgencyHandler {
+	return &AgencyHandler{
+		tenantRepo: tenantRepo,
+	}
+}
+
+type AgencyProfileResponse struct {
+	ID          string `json:"id"`
+	Name        string `json:"name"`
+	CNPJ        string `json:"cnpj"`
+	Email       string `json:"email"`
+	Phone       string `json:"phone"`
+	Website     string `json:"website"`
+	Address     string `json:"address"`
+	City        string `json:"city"`
+	State       string `json:"state"`
+	Zip         string `json:"zip"`
+	RazaoSocial string `json:"razao_social"`
+	Description string `json:"description"`
+	Industry    string `json:"industry"`
+}
+
+type UpdateAgencyProfileRequest struct {
+	Name        string `json:"name"`
+	CNPJ        string `json:"cnpj"`
+	Email       string `json:"email"`
+	Phone       string `json:"phone"`
+	Website     string `json:"website"`
+	Address     string `json:"address"`
+	City        string `json:"city"`
+	State       string `json:"state"`
+	Zip         string `json:"zip"`
+	RazaoSocial string `json:"razao_social"`
+	Description string `json:"description"`
+	Industry    string `json:"industry"`
+}
+
+// GetProfile returns the current agency profile
+func (h *AgencyHandler) GetProfile(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	// Get tenant from context (set by middleware)
+	tenantID := r.Context().Value("tenantID")
+	if tenantID == nil {
+		http.Error(w, "Tenant not found", http.StatusUnauthorized)
+		return
+	}
+
+	// Parse tenant ID
+	tid, err := uuid.Parse(tenantID.(string))
+	if err != nil {
+		http.Error(w, "Invalid tenant ID", http.StatusBadRequest)
+		return
+	}
+
+	// Get tenant from database
+	tenant, err := h.tenantRepo.FindByID(tid)
+	if err != nil {
+		http.Error(w, "Error fetching profile", http.StatusInternalServerError)
+		return
+	}
+	if tenant == nil {
+		http.Error(w, "Tenant not found", http.StatusNotFound)
+		return
+	}
+
+	response := AgencyProfileResponse{
+		ID:          tenant.ID.String(),
+		Name:        tenant.Name,
+		CNPJ:        tenant.CNPJ,
+		Email:       tenant.Email,
+		Phone:       tenant.Phone,
+		Website:     tenant.Website,
+		Address:     tenant.Address,
+		City:        tenant.City,
+		State:       tenant.State,
+		Zip:         tenant.Zip,
+		RazaoSocial: tenant.RazaoSocial,
+		Description: tenant.Description,
+		Industry:    tenant.Industry,
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(response)
+}
+
+// UpdateProfile updates the current agency profile
+func (h *AgencyHandler) UpdateProfile(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPut && r.Method != http.MethodPatch {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	// Get tenant from context
+	tenantID := r.Context().Value("tenantID")
+	if tenantID == nil {
+		http.Error(w, "Tenant not found", http.StatusUnauthorized)
+		return
+	}
+
+	var req UpdateAgencyProfileRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		http.Error(w, "Invalid request body", http.StatusBadRequest)
+		return
+	}
+
+	// Parse tenant ID
+	tid, err := uuid.Parse(tenantID.(string))
+	if err != nil {
+		http.Error(w, "Invalid tenant ID", http.StatusBadRequest)
+		return
+	}
+
+	// Prepare updates
+	updates := map[string]interface{}{
+		"name":         req.Name,
+		"cnpj":         req.CNPJ,
+		"razao_social": req.RazaoSocial,
+		"email":        req.Email,
+		"phone":        req.Phone,
+		"website":      req.Website,
+		"address":      req.Address,
+		"city":         req.City,
+		"state":        req.State,
+		"zip":          req.Zip,
+		"description":  req.Description,
+		"industry":     req.Industry,
+	}
+
+	// Update in database
+	if err := h.tenantRepo.UpdateProfile(tid, updates); err != nil {
+		http.Error(w, "Error updating profile", http.StatusInternalServerError)
+		return
+	}
+
+	// Fetch updated data
+	tenant, err := h.tenantRepo.FindByID(tid)
+	if err != nil {
+		http.Error(w, "Error fetching updated profile", http.StatusInternalServerError)
+		return
+	}
+
+	response := AgencyProfileResponse{
+		ID:          tenant.ID.String(),
+		Name:        tenant.Name,
+		CNPJ:        tenant.CNPJ,
+		Email:       tenant.Email,
+		Phone:       tenant.Phone,
+		Website:     tenant.Website,
+		Address:     tenant.Address,
+		City:        tenant.City,
+		State:       tenant.State,
+		Zip:         tenant.Zip,
+		RazaoSocial: tenant.RazaoSocial,
+		Description: tenant.Description,
+		Industry:    tenant.Industry,
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(response)
+}
--- a/backend/internal/api/handlers/auth.go
+++ b/backend/internal/api/handlers/auth.go
@@ -0,0 +1,139 @@
+package handlers
+
+import (
+	"encoding/json"
+	"io"
+	"net/http"
+	"strings"
+
+	"aggios-app/backend/internal/domain"
+	"aggios-app/backend/internal/service"
+)
+
+// AuthHandler handles authentication endpoints
+type AuthHandler struct {
+	authService *service.AuthService
+}
+
+// NewAuthHandler creates a new auth handler
+func NewAuthHandler(authService *service.AuthService) *AuthHandler {
+	return &AuthHandler{
+		authService: authService,
+	}
+}
+
+// Register handles user registration
+func (h *AuthHandler) Register(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	var req domain.CreateUserRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		http.Error(w, "Invalid request body", http.StatusBadRequest)
+		return
+	}
+
+	user, err := h.authService.Register(req)
+	if err != nil {
+		switch err {
+		case service.ErrEmailAlreadyExists:
+			http.Error(w, err.Error(), http.StatusConflict)
+		case service.ErrWeakPassword:
+			http.Error(w, err.Error(), http.StatusBadRequest)
+		default:
+			http.Error(w, "Internal server error", http.StatusInternalServerError)
+		}
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusCreated)
+	json.NewEncoder(w).Encode(user)
+}
+
+// Login handles user login
+func (h *AuthHandler) Login(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	bodyBytes, err := io.ReadAll(r.Body)
+	if err != nil {
+		http.Error(w, "Failed to read request body", http.StatusBadRequest)
+		return
+	}
+	defer r.Body.Close()
+
+	// Trim whitespace to avoid decode errors caused by BOM or stray chars
+	sanitized := strings.TrimSpace(string(bodyBytes))
+	var req domain.LoginRequest
+	if err := json.Unmarshal([]byte(sanitized), &req); err != nil {
+		http.Error(w, "Invalid request body", http.StatusBadRequest)
+		return
+	}
+
+	response, err := h.authService.Login(req)
+	if err != nil {
+		if err == service.ErrInvalidCredentials {
+			http.Error(w, err.Error(), http.StatusUnauthorized)
+		} else {
+			http.Error(w, "Internal server error", http.StatusInternalServerError)
+		}
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(response)
+}
+
+// ChangePasswordRequest represents a password change request
+type ChangePasswordRequest struct {
+	CurrentPassword string `json:"currentPassword"`
+	NewPassword     string `json:"newPassword"`
+}
+
+// ChangePassword handles password change
+func (h *AuthHandler) ChangePassword(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	// Get user ID from context (set by auth middleware)
+	userID, ok := r.Context().Value("userID").(string)
+	if !ok {
+		http.Error(w, "Unauthorized", http.StatusUnauthorized)
+		return
+	}
+
+	var req ChangePasswordRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		http.Error(w, "Invalid request body", http.StatusBadRequest)
+		return
+	}
+
+	if req.CurrentPassword == "" || req.NewPassword == "" {
+		http.Error(w, "Current password and new password are required", http.StatusBadRequest)
+		return
+	}
+
+	// Call auth service to change password
+	if err := h.authService.ChangePassword(userID, req.CurrentPassword, req.NewPassword); err != nil {
+		if err == service.ErrInvalidCredentials {
+			http.Error(w, "Current password is incorrect", http.StatusUnauthorized)
+		} else if err == service.ErrWeakPassword {
+			http.Error(w, "New password is too weak", http.StatusBadRequest)
+		} else {
+			http.Error(w, "Error changing password", http.StatusInternalServerError)
+		}
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(map[string]string{
+		"message": "Password changed successfully",
+	})
+}
--- a/backend/internal/api/handlers/company.go
+++ b/backend/internal/api/handlers/company.go
@@ -0,0 +1,90 @@
+package handlers
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"aggios-app/backend/internal/api/middleware"
+	"aggios-app/backend/internal/domain"
+	"aggios-app/backend/internal/service"
+
+	"github.com/google/uuid"
+)
+
+// CompanyHandler handles company endpoints
+type CompanyHandler struct {
+	companyService *service.CompanyService
+}
+
+// NewCompanyHandler creates a new company handler
+func NewCompanyHandler(companyService *service.CompanyService) *CompanyHandler {
+	return &CompanyHandler{
+		companyService: companyService,
+	}
+}
+
+// Create handles company creation
+func (h *CompanyHandler) Create(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	// Get user ID from context (set by auth middleware)
+	userIDStr, ok := r.Context().Value(middleware.UserIDKey).(string)
+	if !ok {
+		http.Error(w, "Unauthorized", http.StatusUnauthorized)
+		return
+	}
+
+	userID, err := uuid.Parse(userIDStr)
+	if err != nil {
+		http.Error(w, "Invalid user ID", http.StatusBadRequest)
+		return
+	}
+
+	var req domain.CreateCompanyRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		http.Error(w, "Invalid request body", http.StatusBadRequest)
+		return
+	}
+
+	// TODO: Get tenantID from user context
+	// For now, this is a placeholder - you'll need to get the tenant from the authenticated user
+	tenantID := uuid.New() // Replace with actual tenant from user
+
+	company, err := h.companyService.Create(req, tenantID, userID)
+	if err != nil {
+		switch err {
+		case service.ErrCNPJAlreadyExists:
+			http.Error(w, err.Error(), http.StatusConflict)
+		default:
+			http.Error(w, "Internal server error", http.StatusInternalServerError)
+		}
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusCreated)
+	json.NewEncoder(w).Encode(company)
+}
+
+// List handles listing companies for a tenant
+func (h *CompanyHandler) List(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	// TODO: Get tenantID from authenticated user
+	tenantID := uuid.New() // Replace with actual tenant from user
+
+	companies, err := h.companyService.ListByTenant(tenantID)
+	if err != nil {
+		http.Error(w, "Internal server error", http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(companies)
+}
--- a/backend/internal/api/handlers/health.go
+++ b/backend/internal/api/handlers/health.go
@@ -0,0 +1,31 @@
+package handlers
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+// HealthHandler handles health check endpoint
+type HealthHandler struct{}
+
+// NewHealthHandler creates a new health handler
+func NewHealthHandler() *HealthHandler {
+	return &HealthHandler{}
+}
+
+// Check returns API health status
+func (h *HealthHandler) Check(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	response := map[string]interface{}{
+		"status":  "healthy",
+		"service": "aggios-api",
+		"version": "1.0.0",
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(response)
+}
--- a/backend/internal/api/handlers/tenant.go
+++ b/backend/internal/api/handlers/tenant.go
@@ -0,0 +1,42 @@
+package handlers
+
+import (
+	"encoding/json"
+	"net/http"
+
+	"aggios-app/backend/internal/domain"
+	"aggios-app/backend/internal/service"
+)
+
+// TenantHandler handles tenant/agency listing endpoints
+type TenantHandler struct {
+	tenantService *service.TenantService
+}
+
+// NewTenantHandler creates a new tenant handler
+func NewTenantHandler(tenantService *service.TenantService) *TenantHandler {
+	return &TenantHandler{
+		tenantService: tenantService,
+	}
+}
+
+// ListAll lists all agencies/tenants (SUPERADMIN only)
+func (h *TenantHandler) ListAll(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	tenants, err := h.tenantService.ListAll()
+	if err != nil {
+		http.Error(w, "Internal server error", http.StatusInternalServerError)
+		return
+	}
+
+	if tenants == nil {
+		tenants = []*domain.Tenant{}
+	}
+
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	json.NewEncoder(w).Encode(tenants)
+}
--- a/backend/internal/api/middleware/auth.go
+++ b/backend/internal/api/middleware/auth.go
@@ -0,0 +1,53 @@
+package middleware
+
+import (
+	"context"
+	"net/http"
+	"strings"
+
+	"aggios-app/backend/internal/config"
+
+	"github.com/golang-jwt/jwt/v5"
+)
+
+type contextKey string
+
+const UserIDKey contextKey = "userID"
+
+// Auth validates JWT tokens
+func Auth(cfg *config.Config) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			authHeader := r.Header.Get("Authorization")
+			if authHeader == "" {
+				http.Error(w, "Unauthorized", http.StatusUnauthorized)
+				return
+			}
+
+			bearerToken := strings.Split(authHeader, " ")
+			if len(bearerToken) != 2 || bearerToken[0] != "Bearer" {
+				http.Error(w, "Invalid token format", http.StatusUnauthorized)
+				return
+			}
+
+			token, err := jwt.Parse(bearerToken[1], func(token *jwt.Token) (interface{}, error) {
+				return []byte(cfg.JWT.Secret), nil
+			})
+
+			if err != nil || !token.Valid {
+				http.Error(w, "Invalid token", http.StatusUnauthorized)
+				return
+			}
+
+			claims, ok := token.Claims.(jwt.MapClaims)
+			if !ok {
+				http.Error(w, "Invalid token claims", http.StatusUnauthorized)
+				return
+			}
+
+			userID := claims["user_id"].(string)
+			ctx := context.WithValue(r.Context(), UserIDKey, userID)
+			next.ServeHTTP(w, r.WithContext(ctx))
+		})
+	}
+}
--- a/backend/internal/api/middleware/cors.go
+++ b/backend/internal/api/middleware/cors.go
@@ -0,0 +1,34 @@
+package middleware
+
+import (
+	"net/http"
+
+	"aggios-app/backend/internal/config"
+)
+
+// CORS adds CORS headers to responses
+func CORS(cfg *config.Config) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			origin := r.Header.Get("Origin")
+			
+			// Allow all localhost origins for development
+			if origin != "" {
+				w.Header().Set("Access-Control-Allow-Origin", origin)
+				w.Header().Set("Access-Control-Allow-Credentials", "true")
+			}
+			
+			w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
+			w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization, Host")
+			w.Header().Set("Access-Control-Max-Age", "3600")
+
+			// Handle preflight request
+			if r.Method == "OPTIONS" {
+				w.WriteHeader(http.StatusOK)
+				return
+			}
+
+			next.ServeHTTP(w, r)
+		})
+	}
+}
--- a/backend/internal/api/middleware/ratelimit.go
+++ b/backend/internal/api/middleware/ratelimit.go
@@ -0,0 +1,96 @@
+package middleware
+
+import (
+	"net/http"
+	"sync"
+	"time"
+
+	"aggios-app/backend/internal/config"
+)
+
+type rateLimiter struct {
+	mu       sync.Mutex
+	attempts map[string][]time.Time
+	maxAttempts int
+}
+
+func newRateLimiter(maxAttempts int) *rateLimiter {
+	rl := &rateLimiter{
+		attempts: make(map[string][]time.Time),
+		maxAttempts: maxAttempts,
+	}
+	
+	// Clean old entries every minute
+	go func() {
+		ticker := time.NewTicker(1 * time.Minute)
+		defer ticker.Stop()
+		for range ticker.C {
+			rl.cleanup()
+		}
+	}()
+	
+	return rl
+}
+
+func (rl *rateLimiter) cleanup() {
+	rl.mu.Lock()
+	defer rl.mu.Unlock()
+	
+	now := time.Now()
+	for ip, attempts := range rl.attempts {
+		var valid []time.Time
+		for _, t := range attempts {
+			if now.Sub(t) < time.Minute {
+				valid = append(valid, t)
+			}
+		}
+		if len(valid) == 0 {
+			delete(rl.attempts, ip)
+		} else {
+			rl.attempts[ip] = valid
+		}
+	}
+}
+
+func (rl *rateLimiter) isAllowed(ip string) bool {
+	rl.mu.Lock()
+	defer rl.mu.Unlock()
+	
+	now := time.Now()
+	attempts := rl.attempts[ip]
+	
+	// Filter attempts within the last minute
+	var validAttempts []time.Time
+	for _, t := range attempts {
+		if now.Sub(t) < time.Minute {
+			validAttempts = append(validAttempts, t)
+		}
+	}
+	
+	if len(validAttempts) >= rl.maxAttempts {
+		return false
+	}
+	
+	validAttempts = append(validAttempts, now)
+	rl.attempts[ip] = validAttempts
+	
+	return true
+}
+
+// RateLimit limits requests per IP address
+func RateLimit(cfg *config.Config) func(http.Handler) http.Handler {
+	limiter := newRateLimiter(cfg.Security.MaxAttemptsPerMin)
+	
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			ip := r.RemoteAddr
+			
+			if !limiter.isAllowed(ip) {
+				http.Error(w, "Too many requests", http.StatusTooManyRequests)
+				return
+			}
+			
+			next.ServeHTTP(w, r)
+		})
+	}
+}
--- a/backend/internal/api/middleware/security.go
+++ b/backend/internal/api/middleware/security.go
@@ -0,0 +1,17 @@
+package middleware
+
+import (
+	"net/http"
+)
+
+// SecurityHeaders adds security headers to responses
+func SecurityHeaders(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("X-Content-Type-Options", "nosniff")
+		w.Header().Set("X-Frame-Options", "DENY")
+		w.Header().Set("X-XSS-Protection", "1; mode=block")
+		w.Header().Set("Referrer-Policy", "strict-origin-when-cross-origin")
+		
+		next.ServeHTTP(w, r)
+	})
+}
--- a/backend/internal/api/middleware/tenant.go
+++ b/backend/internal/api/middleware/tenant.go
@@ -0,0 +1,56 @@
+package middleware
+
+import (
+	"context"
+	"net/http"
+	"strings"
+
+	"aggios-app/backend/internal/repository"
+)
+
+type tenantContextKey string
+
+const TenantIDKey tenantContextKey = "tenantID"
+const SubdomainKey tenantContextKey = "subdomain"
+
+// TenantDetector detects tenant from subdomain
+func TenantDetector(tenantRepo *repository.TenantRepository) func(http.Handler) http.Handler {
+	return func(next http.Handler) http.Handler {
+		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			host := r.Host
+			
+			// Extract subdomain
+			// Examples:
+			// - agencia-xyz.localhost -> agencia-xyz
+			// - agencia-xyz.aggios.app -> agencia-xyz
+			// - dash.localhost -> dash (master admin)
+			// - localhost -> (institutional site)
+			
+			parts := strings.Split(host, ".")
+			var subdomain string
+			
+			if len(parts) >= 2 {
+				// Has subdomain
+				subdomain = parts[0]
+				
+				// Remove port if present
+				if strings.Contains(subdomain, ":") {
+					subdomain = strings.Split(subdomain, ":")[0]
+				}
+			}
+			
+			// Add subdomain to context
+			ctx := context.WithValue(r.Context(), SubdomainKey, subdomain)
+			
+			// If subdomain is not empty and not "dash" or "api", try to find tenant
+			if subdomain != "" && subdomain != "dash" && subdomain != "api" && subdomain != "localhost" {
+				tenant, err := tenantRepo.FindBySubdomain(subdomain)
+				if err == nil && tenant != nil {
+					ctx = context.WithValue(ctx, TenantIDKey, tenant.ID.String())
+				}
+			}
+			
+			next.ServeHTTP(w, r.WithContext(ctx))
+		})
+	}
+}
--- a/backend/internal/config/config.go
+++ b/backend/internal/config/config.go
@@ -0,0 +1,96 @@
+package config
+
+import (
+	"os"
+)
+
+// Config holds all application configuration
+type Config struct {
+	Server   ServerConfig
+	Database DatabaseConfig
+	JWT      JWTConfig
+	Security SecurityConfig
+	App      AppConfig
+}
+
+// AppConfig holds application-level settings
+type AppConfig struct {
+	Environment  string // "development" or "production"
+	BaseDomain   string // "localhost" or "aggios.app"
+}
+
+// ServerConfig holds server-specific configuration
+type ServerConfig struct {
+	Port string
+}
+
+// DatabaseConfig holds database connection settings
+type DatabaseConfig struct {
+	Host     string
+	Port     string
+	User     string
+	Password string
+	Name     string
+}
+
+// JWTConfig holds JWT configuration
+type JWTConfig struct {
+	Secret string
+}
+
+// SecurityConfig holds security settings
+type SecurityConfig struct {
+	AllowedOrigins      []string
+	MaxAttemptsPerMin   int
+	PasswordMinLength   int
+}
+
+// Load loads configuration from environment variables
+func Load() *Config {
+	env := getEnvOrDefault("APP_ENV", "development")
+	baseDomain := "localhost"
+	if env == "production" {
+		baseDomain = "aggios.app"
+	}
+
+	return &Config{
+		Server: ServerConfig{
+			Port: getEnvOrDefault("SERVER_PORT", "8080"),
+		},
+		Database: DatabaseConfig{
+			Host:     getEnvOrDefault("DB_HOST", "localhost"),
+			Port:     getEnvOrDefault("DB_PORT", "5432"),
+			User:     getEnvOrDefault("DB_USER", "postgres"),
+			Password: getEnvOrDefault("DB_PASSWORD", "postgres"),
+			Name:     getEnvOrDefault("DB_NAME", "aggios"),
+		},
+		JWT: JWTConfig{
+			Secret: getEnvOrDefault("JWT_SECRET", "INSECURE-fallback-secret-CHANGE-THIS"),
+		},
+		App: AppConfig{
+			Environment: env,
+			BaseDomain:  baseDomain,
+		},
+		Security: SecurityConfig{
+			AllowedOrigins: []string{
+				"http://localhost",
+				"http://dash.localhost",
+				"http://aggios.local",
+				"http://dash.aggios.local",
+				"https://aggios.app",
+				"https://dash.aggios.app",
+				"https://www.aggios.app",
+			},
+			MaxAttemptsPerMin: 5,
+			PasswordMinLength: 8,
+		},
+	}
+}
+
+// getEnvOrDefault returns environment variable or default value
+func getEnvOrDefault(key, defaultValue string) string {
+	if value := os.Getenv(key); value != "" {
+		return value
+	}
+	return defaultValue
+}
--- a/backend/internal/domain/company.go
+++ b/backend/internal/domain/company.go
@@ -0,0 +1,31 @@
+package domain
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+)
+
+// Company represents a company in the system
+type Company struct {
+	ID              uuid.UUID  `json:"id" db:"id"`
+	CNPJ            string     `json:"cnpj" db:"cnpj"`
+	RazaoSocial     string     `json:"razao_social" db:"razao_social"`
+	NomeFantasia    string     `json:"nome_fantasia" db:"nome_fantasia"`
+	Email           string     `json:"email" db:"email"`
+	Telefone        string     `json:"telefone" db:"telefone"`
+	Status          string     `json:"status" db:"status"`
+	TenantID        uuid.UUID  `json:"tenant_id" db:"tenant_id"`
+	CreatedByUserID *uuid.UUID `json:"created_by_user_id,omitempty" db:"created_by_user_id"`
+	CreatedAt       time.Time  `json:"created_at" db:"created_at"`
+	UpdatedAt       time.Time  `json:"updated_at" db:"updated_at"`
+}
+
+// CreateCompanyRequest represents the request to create a new company
+type CreateCompanyRequest struct {
+	CNPJ         string `json:"cnpj"`
+	RazaoSocial  string `json:"razao_social"`
+	NomeFantasia string `json:"nome_fantasia"`
+	Email        string `json:"email"`
+	Telefone     string `json:"telefone"`
+}
--- a/backend/internal/domain/tenant.go
+++ b/backend/internal/domain/tenant.go
@@ -0,0 +1,43 @@
+package domain
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+)
+
+// Tenant represents a tenant (agency) in the system
+type Tenant struct {
+	ID          uuid.UUID `json:"id" db:"id"`
+	Name        string    `json:"name" db:"name"`
+	Domain      string    `json:"domain" db:"domain"`
+	Subdomain   string    `json:"subdomain" db:"subdomain"`
+	CNPJ        string    `json:"cnpj,omitempty" db:"cnpj"`
+	RazaoSocial string    `json:"razao_social,omitempty" db:"razao_social"`
+	Email       string    `json:"email,omitempty" db:"email"`
+	Phone       string    `json:"phone,omitempty" db:"phone"`
+	Website     string    `json:"website,omitempty" db:"website"`
+	Address     string    `json:"address,omitempty" db:"address"`
+	City        string    `json:"city,omitempty" db:"city"`
+	State       string    `json:"state,omitempty" db:"state"`
+	Zip         string    `json:"zip,omitempty" db:"zip"`
+	Description string    `json:"description,omitempty" db:"description"`
+	Industry    string    `json:"industry,omitempty" db:"industry"`
+	IsActive    bool      `json:"is_active" db:"is_active"`
+	CreatedAt   time.Time `json:"created_at" db:"created_at"`
+	UpdatedAt   time.Time `json:"updated_at" db:"updated_at"`
+}
+
+// CreateTenantRequest represents the request to create a new tenant
+type CreateTenantRequest struct {
+	Name      string `json:"name"`
+	Domain    string `json:"domain"`
+	Subdomain string `json:"subdomain"`
+}
+
+// AgencyDetails aggregates tenant info with its admin user for superadmin view
+type AgencyDetails struct {
+	Tenant    *Tenant `json:"tenant"`
+	Admin     *User   `json:"admin,omitempty"`
+	AccessURL string  `json:"access_url"`
+}
--- a/backend/internal/domain/user.go
+++ b/backend/internal/domain/user.go
@@ -0,0 +1,73 @@
+package domain
+
+import (
+	"time"
+
+	"github.com/google/uuid"
+)
+
+// User represents a user in the system
+type User struct {
+	ID        uuid.UUID  `json:"id" db:"id"`
+	TenantID  *uuid.UUID `json:"tenant_id,omitempty" db:"tenant_id"`
+	Email     string     `json:"email" db:"email"`
+	Password  string     `json:"-" db:"password_hash"`
+	Name      string     `json:"name" db:"first_name"`
+	Role      string     `json:"role" db:"role"` // SUPERADMIN, ADMIN_AGENCIA, CLIENTE
+	CreatedAt time.Time  `json:"created_at" db:"created_at"`
+	UpdatedAt time.Time  `json:"updated_at" db:"updated_at"`
+}
+
+// CreateUserRequest represents the request to create a new user
+type CreateUserRequest struct {
+	Email    string `json:"email"`
+	Password string `json:"password"`
+	Name     string `json:"name"`
+	Role     string `json:"role,omitempty"` // Optional, defaults to CLIENTE
+}
+
+// RegisterAgencyRequest represents agency registration (SUPERADMIN only)
+type RegisterAgencyRequest struct {
+	// Agência
+	AgencyName  string `json:"agencyName"`
+	Subdomain   string `json:"subdomain"`
+	CNPJ        string `json:"cnpj"`
+	RazaoSocial string `json:"razaoSocial"`
+	Description string `json:"description"`
+	Website     string `json:"website"`
+	Industry    string `json:"industry"`
+	
+	// Endereço
+	CEP          string `json:"cep"`
+	State        string `json:"state"`
+	City         string `json:"city"`
+	Neighborhood string `json:"neighborhood"`
+	Street       string `json:"street"`
+	Number       string `json:"number"`
+	Complement   string `json:"complement"`
+	
+	// Admin da Agência
+	AdminEmail    string `json:"adminEmail"`
+	AdminPassword string `json:"adminPassword"`
+	AdminName     string `json:"adminName"`
+}
+
+// RegisterClientRequest represents client registration (ADMIN_AGENCIA only)
+type RegisterClientRequest struct {
+	Email    string `json:"email"`
+	Password string `json:"password"`
+	Name     string `json:"name"`
+}
+
+// LoginRequest represents the login request
+type LoginRequest struct {
+	Email    string `json:"email"`
+	Password string `json:"password"`
+}
+
+// LoginResponse represents the login response
+type LoginResponse struct {
+	Token     string  `json:"token"`
+	User      User    `json:"user"`
+	Subdomain *string `json:"subdomain,omitempty"`
+}
--- a/backend/internal/repository/company_repository.go
+++ b/backend/internal/repository/company_repository.go
@@ -0,0 +1,127 @@
+package repository
+
+import (
+	"database/sql"
+	"time"
+
+	"aggios-app/backend/internal/domain"
+
+	"github.com/google/uuid"
+)
+
+// CompanyRepository handles database operations for companies
+type CompanyRepository struct {
+	db *sql.DB
+}
+
+// NewCompanyRepository creates a new company repository
+func NewCompanyRepository(db *sql.DB) *CompanyRepository {
+	return &CompanyRepository{db: db}
+}
+
+// Create creates a new company
+func (r *CompanyRepository) Create(company *domain.Company) error {
+	query := `
+		INSERT INTO companies (id, cnpj, razao_social, nome_fantasia, email, telefone, status, tenant_id, created_by_user_id, created_at, updated_at)
+		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11)
+		RETURNING id, created_at, updated_at
+	`
+	
+	now := time.Now()
+	company.ID = uuid.New()
+	company.CreatedAt = now
+	company.UpdatedAt = now
+	
+	return r.db.QueryRow(
+		query,
+		company.ID,
+		company.CNPJ,
+		company.RazaoSocial,
+		company.NomeFantasia,
+		company.Email,
+		company.Telefone,
+		company.Status,
+		company.TenantID,
+		company.CreatedByUserID,
+		company.CreatedAt,
+		company.UpdatedAt,
+	).Scan(&company.ID, &company.CreatedAt, &company.UpdatedAt)
+}
+
+// FindByID finds a company by ID
+func (r *CompanyRepository) FindByID(id uuid.UUID) (*domain.Company, error) {
+	query := `
+		SELECT id, cnpj, razao_social, nome_fantasia, email, telefone, status, tenant_id, created_by_user_id, created_at, updated_at
+		FROM companies
+		WHERE id = $1
+	`
+	
+	company := &domain.Company{}
+	err := r.db.QueryRow(query, id).Scan(
+		&company.ID,
+		&company.CNPJ,
+		&company.RazaoSocial,
+		&company.NomeFantasia,
+		&company.Email,
+		&company.Telefone,
+		&company.Status,
+		&company.TenantID,
+		&company.CreatedByUserID,
+		&company.CreatedAt,
+		&company.UpdatedAt,
+	)
+	
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+	
+	return company, err
+}
+
+// FindByTenantID finds all companies for a tenant
+func (r *CompanyRepository) FindByTenantID(tenantID uuid.UUID) ([]*domain.Company, error) {
+	query := `
+		SELECT id, cnpj, razao_social, nome_fantasia, email, telefone, status, tenant_id, created_by_user_id, created_at, updated_at
+		FROM companies
+		WHERE tenant_id = $1
+		ORDER BY created_at DESC
+	`
+	
+	rows, err := r.db.Query(query, tenantID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	
+	var companies []*domain.Company
+	for rows.Next() {
+		company := &domain.Company{}
+		err := rows.Scan(
+			&company.ID,
+			&company.CNPJ,
+			&company.RazaoSocial,
+			&company.NomeFantasia,
+			&company.Email,
+			&company.Telefone,
+			&company.Status,
+			&company.TenantID,
+			&company.CreatedByUserID,
+			&company.CreatedAt,
+			&company.UpdatedAt,
+		)
+		if err != nil {
+			return nil, err
+		}
+		companies = append(companies, company)
+	}
+	
+	return companies, nil
+}
+
+// CNPJExists checks if a CNPJ is already registered for a tenant
+func (r *CompanyRepository) CNPJExists(cnpj string, tenantID uuid.UUID) (bool, error) {
+	var exists bool
+	query := `SELECT EXISTS(SELECT 1 FROM companies WHERE cnpj = $1 AND tenant_id = $2)`
+	err := r.db.QueryRow(query, cnpj, tenantID).Scan(&exists)
+	return exists, err
+}
--- a/backend/internal/repository/tenant_repository.go
+++ b/backend/internal/repository/tenant_repository.go
@@ -0,0 +1,268 @@
+package repository
+
+import (
+	"database/sql"
+	"time"
+
+	"aggios-app/backend/internal/domain"
+
+	"github.com/google/uuid"
+)
+
+// TenantRepository handles database operations for tenants
+type TenantRepository struct {
+	db *sql.DB
+}
+
+// NewTenantRepository creates a new tenant repository
+func NewTenantRepository(db *sql.DB) *TenantRepository {
+	return &TenantRepository{db: db}
+}
+
+// Create creates a new tenant
+func (r *TenantRepository) Create(tenant *domain.Tenant) error {
+	query := `
+		INSERT INTO tenants (
+			id, name, domain, subdomain, cnpj, razao_social, email, website, 
+			address, city, state, zip, description, industry, created_at, updated_at
+		)
+		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11, $12, $13, $14, $15, $16)
+		RETURNING id, created_at, updated_at
+	`
+
+	now := time.Now()
+	tenant.ID = uuid.New()
+	tenant.CreatedAt = now
+	tenant.UpdatedAt = now
+
+	return r.db.QueryRow(
+		query,
+		tenant.ID,
+		tenant.Name,
+		tenant.Domain,
+		tenant.Subdomain,
+		tenant.CNPJ,
+		tenant.RazaoSocial,
+		tenant.Email,
+		tenant.Website,
+		tenant.Address,
+		tenant.City,
+		tenant.State,
+		tenant.Zip,
+		tenant.Description,
+		tenant.Industry,
+		tenant.CreatedAt,
+		tenant.UpdatedAt,
+	).Scan(&tenant.ID, &tenant.CreatedAt, &tenant.UpdatedAt)
+}
+
+// FindByID finds a tenant by ID
+func (r *TenantRepository) FindByID(id uuid.UUID) (*domain.Tenant, error) {
+	query := `
+		SELECT id, name, domain, subdomain, cnpj, razao_social, email, phone, website, 
+		       address, city, state, zip, description, industry, is_active, created_at, updated_at
+		FROM tenants
+		WHERE id = $1
+	`
+
+	tenant := &domain.Tenant{}
+	var cnpj, razaoSocial, email, phone, website, address, city, state, zip, description, industry sql.NullString
+
+	err := r.db.QueryRow(query, id).Scan(
+		&tenant.ID,
+		&tenant.Name,
+		&tenant.Domain,
+		&tenant.Subdomain,
+		&cnpj,
+		&razaoSocial,
+		&email,
+		&phone,
+		&website,
+		&address,
+		&city,
+		&state,
+		&zip,
+		&description,
+		&industry,
+		&tenant.IsActive,
+		&tenant.CreatedAt,
+		&tenant.UpdatedAt,
+	)
+
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	// Handle nullable fields
+	if cnpj.Valid {
+		tenant.CNPJ = cnpj.String
+	}
+	if razaoSocial.Valid {
+		tenant.RazaoSocial = razaoSocial.String
+	}
+	if email.Valid {
+		tenant.Email = email.String
+	}
+	if phone.Valid {
+		tenant.Phone = phone.String
+	}
+	if website.Valid {
+		tenant.Website = website.String
+	}
+	if address.Valid {
+		tenant.Address = address.String
+	}
+	if city.Valid {
+		tenant.City = city.String
+	}
+	if state.Valid {
+		tenant.State = state.String
+	}
+	if zip.Valid {
+		tenant.Zip = zip.String
+	}
+	if description.Valid {
+		tenant.Description = description.String
+	}
+	if industry.Valid {
+		tenant.Industry = industry.String
+	}
+
+	return tenant, nil
+}
+
+// FindBySubdomain finds a tenant by subdomain
+func (r *TenantRepository) FindBySubdomain(subdomain string) (*domain.Tenant, error) {
+	query := `
+		SELECT id, name, domain, subdomain, created_at, updated_at
+		FROM tenants
+		WHERE subdomain = $1
+	`
+
+	tenant := &domain.Tenant{}
+	err := r.db.QueryRow(query, subdomain).Scan(
+		&tenant.ID,
+		&tenant.Name,
+		&tenant.Domain,
+		&tenant.Subdomain,
+		&tenant.CreatedAt,
+		&tenant.UpdatedAt,
+	)
+
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+
+	return tenant, err
+}
+
+// SubdomainExists checks if a subdomain is already taken
+func (r *TenantRepository) SubdomainExists(subdomain string) (bool, error) {
+	var exists bool
+	query := `SELECT EXISTS(SELECT 1 FROM tenants WHERE subdomain = $1)`
+	err := r.db.QueryRow(query, subdomain).Scan(&exists)
+	return exists, err
+}
+
+// FindAll returns all tenants
+func (r *TenantRepository) FindAll() ([]*domain.Tenant, error) {
+	query := `
+		SELECT id, name, domain, subdomain, is_active, created_at, updated_at
+		FROM tenants
+		ORDER BY created_at DESC
+	`
+
+	rows, err := r.db.Query(query)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var tenants []*domain.Tenant
+	for rows.Next() {
+		tenant := &domain.Tenant{}
+		err := rows.Scan(
+			&tenant.ID,
+			&tenant.Name,
+			&tenant.Domain,
+			&tenant.Subdomain,
+			&tenant.IsActive,
+			&tenant.CreatedAt,
+			&tenant.UpdatedAt,
+		)
+		if err != nil {
+			return nil, err
+		}
+		tenants = append(tenants, tenant)
+	}
+
+	if tenants == nil {
+		return []*domain.Tenant{}, nil
+	}
+
+	return tenants, nil
+}
+
+// Delete removes a tenant (and cascades to related data)
+func (r *TenantRepository) Delete(id uuid.UUID) error {
+	result, err := r.db.Exec(`DELETE FROM tenants WHERE id = $1`, id)
+	if err != nil {
+		return err
+	}
+
+	rows, err := result.RowsAffected()
+	if err != nil {
+		return err
+	}
+
+	if rows == 0 {
+		return sql.ErrNoRows
+	}
+
+	return nil
+}
+
+// UpdateProfile updates tenant profile information
+func (r *TenantRepository) UpdateProfile(id uuid.UUID, updates map[string]interface{}) error {
+	query := `
+		UPDATE tenants SET
+			name = COALESCE($1, name),
+			cnpj = COALESCE($2, cnpj),
+			razao_social = COALESCE($3, razao_social),
+			email = COALESCE($4, email),
+			phone = COALESCE($5, phone),
+			website = COALESCE($6, website),
+			address = COALESCE($7, address),
+			city = COALESCE($8, city),
+			state = COALESCE($9, state),
+			zip = COALESCE($10, zip),
+			description = COALESCE($11, description),
+			industry = COALESCE($12, industry),
+			updated_at = $13
+		WHERE id = $14
+	`
+
+	_, err := r.db.Exec(
+		query,
+		updates["name"],
+		updates["cnpj"],
+		updates["razao_social"],
+		updates["email"],
+		updates["phone"],
+		updates["website"],
+		updates["address"],
+		updates["city"],
+		updates["state"],
+		updates["zip"],
+		updates["description"],
+		updates["industry"],
+		time.Now(),
+		id,
+	)
+
+	return err
+}
--- a/backend/internal/repository/user_repository.go
+++ b/backend/internal/repository/user_repository.go
@@ -0,0 +1,154 @@
+package repository
+
+import (
+	"database/sql"
+	"time"
+
+	"aggios-app/backend/internal/domain"
+
+	"github.com/google/uuid"
+)
+
+// UserRepository handles database operations for users
+type UserRepository struct {
+	db *sql.DB
+}
+
+// NewUserRepository creates a new user repository
+func NewUserRepository(db *sql.DB) *UserRepository {
+	return &UserRepository{db: db}
+}
+
+// Create creates a new user
+func (r *UserRepository) Create(user *domain.User) error {
+	query := `
+		INSERT INTO users (id, tenant_id, email, password_hash, first_name, role, is_active, created_at, updated_at)
+		VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)
+		RETURNING id, created_at, updated_at
+	`
+
+	now := time.Now()
+	user.ID = uuid.New()
+	user.CreatedAt = now
+	user.UpdatedAt = now
+
+	// Default role to CLIENTE if not specified
+	if user.Role == "" {
+		user.Role = "CLIENTE"
+	}
+
+	return r.db.QueryRow(
+		query,
+		user.ID,
+		user.TenantID,
+		user.Email,
+		user.Password,
+		user.Name,
+		user.Role,
+		true, // is_active
+		user.CreatedAt,
+		user.UpdatedAt,
+	).Scan(&user.ID, &user.CreatedAt, &user.UpdatedAt)
+}
+
+// FindByEmail finds a user by email
+func (r *UserRepository) FindByEmail(email string) (*domain.User, error) {
+	query := `
+		SELECT id, tenant_id, email, password_hash, first_name, role, created_at, updated_at
+		FROM users
+		WHERE email = $1 AND is_active = true
+	`
+
+	user := &domain.User{}
+	err := r.db.QueryRow(query, email).Scan(
+		&user.ID,
+		&user.TenantID,
+		&user.Email,
+		&user.Password,
+		&user.Name,
+		&user.Role,
+		&user.CreatedAt,
+		&user.UpdatedAt,
+	)
+
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+
+	return user, err
+}
+
+// FindByID finds a user by ID
+func (r *UserRepository) FindByID(id uuid.UUID) (*domain.User, error) {
+	query := `
+		SELECT id, tenant_id, email, password_hash, first_name, role, created_at, updated_at
+		FROM users
+		WHERE id = $1 AND is_active = true
+	`
+
+	user := &domain.User{}
+	err := r.db.QueryRow(query, id).Scan(
+		&user.ID,
+		&user.TenantID,
+		&user.Email,
+		&user.Password,
+		&user.Name,
+		&user.Role,
+		&user.CreatedAt,
+		&user.UpdatedAt,
+	)
+
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+
+	return user, err
+}
+
+// EmailExists checks if an email is already registered
+func (r *UserRepository) EmailExists(email string) (bool, error) {
+	var exists bool
+	query := `SELECT EXISTS(SELECT 1 FROM users WHERE email = $1)`
+	err := r.db.QueryRow(query, email).Scan(&exists)
+	return exists, err
+}
+
+// UpdatePassword updates a user's password
+func (r *UserRepository) UpdatePassword(userID, hashedPassword string) error {
+	query := `UPDATE users SET password_hash = $1, updated_at = $2 WHERE id = $3`
+	_, err := r.db.Exec(query, hashedPassword, time.Now(), userID)
+	return err
+}
+
+// FindAdminByTenantID returns the primary admin user for a tenant
+func (r *UserRepository) FindAdminByTenantID(tenantID uuid.UUID) (*domain.User, error) {
+	query := `
+		SELECT id, tenant_id, email, password_hash, first_name, role, created_at, updated_at
+		FROM users
+		WHERE tenant_id = $1 AND role = 'ADMIN_AGENCIA' AND is_active = true
+		ORDER BY created_at ASC
+		LIMIT 1
+	`
+
+	user := &domain.User{}
+	err := r.db.QueryRow(query, tenantID).Scan(
+		&user.ID,
+		&user.TenantID,
+		&user.Email,
+		&user.Password,
+		&user.Name,
+		&user.Role,
+		&user.CreatedAt,
+		&user.UpdatedAt,
+	)
+
+	if err == sql.ErrNoRows {
+		return nil, nil
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	return user, nil
+}
--- a/backend/internal/service/agency_service.go
+++ b/backend/internal/service/agency_service.go
@@ -0,0 +1,191 @@
+package service
+
+import (
+	"aggios-app/backend/internal/config"
+	"aggios-app/backend/internal/domain"
+	"aggios-app/backend/internal/repository"
+	"fmt"
+
+	"github.com/google/uuid"
+	"golang.org/x/crypto/bcrypt"
+)
+
+// AgencyService handles agency registration and management
+type AgencyService struct {
+	userRepo   *repository.UserRepository
+	tenantRepo *repository.TenantRepository
+	cfg        *config.Config
+}
+
+// NewAgencyService creates a new agency service
+func NewAgencyService(userRepo *repository.UserRepository, tenantRepo *repository.TenantRepository, cfg *config.Config) *AgencyService {
+	return &AgencyService{
+		userRepo:   userRepo,
+		tenantRepo: tenantRepo,
+		cfg:        cfg,
+	}
+}
+
+// RegisterAgency creates a new agency (tenant) and its admin user
+// Only SUPERADMIN can call this
+func (s *AgencyService) RegisterAgency(req domain.RegisterAgencyRequest) (*domain.Tenant, *domain.User, error) {
+	// Validate password
+	if len(req.AdminPassword) < s.cfg.Security.PasswordMinLength {
+		return nil, nil, ErrWeakPassword
+	}
+
+	// Check if subdomain is available
+	exists, err := s.tenantRepo.SubdomainExists(req.Subdomain)
+	if err != nil {
+		return nil, nil, err
+	}
+	if exists {
+		return nil, nil, ErrSubdomainTaken
+	}
+
+	// Check if admin email already exists
+	emailExists, err := s.userRepo.EmailExists(req.AdminEmail)
+	if err != nil {
+		return nil, nil, err
+	}
+	if emailExists {
+		return nil, nil, ErrEmailAlreadyExists
+	}
+
+	// Create tenant
+	address := req.Street
+	if req.Number != "" {
+		address += ", " + req.Number
+	}
+	if req.Complement != "" {
+		address += " - " + req.Complement
+	}
+	if req.Neighborhood != "" {
+		address += " - " + req.Neighborhood
+	}
+
+	tenant := &domain.Tenant{
+		Name:        req.AgencyName,
+		Domain:      fmt.Sprintf("%s.%s", req.Subdomain, s.cfg.App.BaseDomain),
+		Subdomain:   req.Subdomain,
+		CNPJ:        req.CNPJ,
+		RazaoSocial: req.RazaoSocial,
+		Email:       req.AdminEmail,
+		Website:     req.Website,
+		Address:     address,
+		City:        req.City,
+		State:       req.State,
+		Zip:         req.CEP,
+		Description: req.Description,
+		Industry:    req.Industry,
+	}
+
+	if err := s.tenantRepo.Create(tenant); err != nil {
+		return nil, nil, err
+	}
+
+	// Hash password
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(req.AdminPassword), bcrypt.DefaultCost)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	// Create admin user for the agency
+	adminUser := &domain.User{
+		TenantID: &tenant.ID,
+		Email:    req.AdminEmail,
+		Password: string(hashedPassword),
+		Name:     req.AdminName,
+		Role:     "ADMIN_AGENCIA",
+	}
+
+	if err := s.userRepo.Create(adminUser); err != nil {
+		return nil, nil, err
+	}
+
+	return tenant, adminUser, nil
+}
+
+// RegisterClient creates a new client user for a specific agency
+// Only ADMIN_AGENCIA can call this
+func (s *AgencyService) RegisterClient(req domain.RegisterClientRequest, tenantID uuid.UUID) (*domain.User, error) {
+	// Validate password
+	if len(req.Password) < s.cfg.Security.PasswordMinLength {
+		return nil, ErrWeakPassword
+	}
+
+	// Check if email already exists
+	exists, err := s.userRepo.EmailExists(req.Email)
+	if err != nil {
+		return nil, err
+	}
+	if exists {
+		return nil, ErrEmailAlreadyExists
+	}
+
+	// Hash password
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(req.Password), bcrypt.DefaultCost)
+	if err != nil {
+		return nil, err
+	}
+
+	// Create client user
+	client := &domain.User{
+		TenantID: &tenantID,
+		Email:    req.Email,
+		Password: string(hashedPassword),
+		Name:     req.Name,
+		Role:     "CLIENTE",
+	}
+
+	if err := s.userRepo.Create(client); err != nil {
+		return nil, err
+	}
+
+	return client, nil
+}
+
+// GetAgencyDetails returns tenant and admin information for superadmin view
+func (s *AgencyService) GetAgencyDetails(id uuid.UUID) (*domain.AgencyDetails, error) {
+	tenant, err := s.tenantRepo.FindByID(id)
+	if err != nil {
+		return nil, err
+	}
+	if tenant == nil {
+		return nil, ErrTenantNotFound
+	}
+
+	admin, err := s.userRepo.FindAdminByTenantID(id)
+	if err != nil {
+		return nil, err
+	}
+
+	protocol := "http://"
+	if s.cfg.App.Environment == "production" {
+		protocol = "https://"
+	}
+
+	details := &domain.AgencyDetails{
+		Tenant:    tenant,
+		AccessURL: fmt.Sprintf("%s%s", protocol, tenant.Domain),
+	}
+
+	if admin != nil {
+		details.Admin = admin
+	}
+
+	return details, nil
+}
+
+// DeleteAgency removes a tenant and its related resources
+func (s *AgencyService) DeleteAgency(id uuid.UUID) error {
+	tenant, err := s.tenantRepo.FindByID(id)
+	if err != nil {
+		return err
+	}
+	if tenant == nil {
+		return ErrTenantNotFound
+	}
+
+	return s.tenantRepo.Delete(id)
+}
--- a/backend/internal/service/auth_service.go
+++ b/backend/internal/service/auth_service.go
@@ -0,0 +1,170 @@
+package service
+
+import (
+	"errors"
+	"time"
+
+	"aggios-app/backend/internal/config"
+	"aggios-app/backend/internal/domain"
+	"aggios-app/backend/internal/repository"
+
+	"github.com/golang-jwt/jwt/v5"
+	"github.com/google/uuid"
+	"golang.org/x/crypto/bcrypt"
+)
+
+var (
+	ErrEmailAlreadyExists = errors.New("email already registered")
+	ErrInvalidCredentials = errors.New("invalid email or password")
+	ErrWeakPassword       = errors.New("password too weak")
+	ErrSubdomainTaken     = errors.New("subdomain already taken")
+	ErrUnauthorized       = errors.New("unauthorized access")
+)
+
+// AuthService handles authentication business logic
+type AuthService struct {
+	userRepo   *repository.UserRepository
+	tenantRepo *repository.TenantRepository
+	cfg        *config.Config
+}
+
+// NewAuthService creates a new auth service
+func NewAuthService(userRepo *repository.UserRepository, tenantRepo *repository.TenantRepository, cfg *config.Config) *AuthService {
+	return &AuthService{
+		userRepo:   userRepo,
+		tenantRepo: tenantRepo,
+		cfg:        cfg,
+	}
+}
+
+// Register creates a new user account
+func (s *AuthService) Register(req domain.CreateUserRequest) (*domain.User, error) {
+	// Validate password strength
+	if len(req.Password) < s.cfg.Security.PasswordMinLength {
+		return nil, ErrWeakPassword
+	}
+
+	// Check if email already exists
+	exists, err := s.userRepo.EmailExists(req.Email)
+	if err != nil {
+		return nil, err
+	}
+	if exists {
+		return nil, ErrEmailAlreadyExists
+	}
+
+	// Hash password
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(req.Password), bcrypt.DefaultCost)
+	if err != nil {
+		return nil, err
+	}
+
+	// Create user
+	user := &domain.User{
+		Email:    req.Email,
+		Password: string(hashedPassword),
+		Name:     req.Name,
+	}
+
+	if err := s.userRepo.Create(user); err != nil {
+		return nil, err
+	}
+
+	return user, nil
+}
+
+// Login authenticates a user and returns a JWT token
+func (s *AuthService) Login(req domain.LoginRequest) (*domain.LoginResponse, error) {
+	// Find user by email
+	user, err := s.userRepo.FindByEmail(req.Email)
+	if err != nil {
+		return nil, err
+	}
+	if user == nil {
+		return nil, ErrInvalidCredentials
+	}
+
+	// Verify password
+	if err := bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(req.Password)); err != nil {
+		return nil, ErrInvalidCredentials
+	}
+
+	// Generate JWT token
+	token, err := s.generateToken(user)
+	if err != nil {
+		return nil, err
+	}
+
+	response := &domain.LoginResponse{
+		Token: token,
+		User:  *user,
+	}
+
+	// If user has a tenant, get the subdomain
+	if user.TenantID != nil {
+		tenant, err := s.tenantRepo.FindByID(*user.TenantID)
+		if err == nil && tenant != nil {
+			response.Subdomain = &tenant.Subdomain
+		}
+	}
+
+	return response, nil
+}
+
+func (s *AuthService) generateToken(user *domain.User) (string, error) {
+	claims := jwt.MapClaims{
+		"user_id":   user.ID.String(),
+		"email":     user.Email,
+		"role":      user.Role,
+		"tenant_id": nil,
+		"exp":       time.Now().Add(time.Hour * 24 * 7).Unix(), // 7 days
+	}
+	
+	if user.TenantID != nil {
+		claims["tenant_id"] = user.TenantID.String()
+	}
+
+	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
+	return token.SignedString([]byte(s.cfg.JWT.Secret))
+}
+
+// ChangePassword changes a user's password
+func (s *AuthService) ChangePassword(userID string, currentPassword, newPassword string) error {
+	// Validate new password strength
+	if len(newPassword) < s.cfg.Security.PasswordMinLength {
+		return ErrWeakPassword
+	}
+
+	// Parse userID
+	uid, err := parseUUID(userID)
+	if err != nil {
+		return ErrInvalidCredentials
+	}
+
+	// Find user
+	user, err := s.userRepo.FindByID(uid)
+	if err != nil {
+		return err
+	}
+	if user == nil {
+		return ErrInvalidCredentials
+	}
+
+	// Verify current password
+	if err := bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(currentPassword)); err != nil {
+		return ErrInvalidCredentials
+	}
+
+	// Hash new password
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(newPassword), bcrypt.DefaultCost)
+	if err != nil {
+		return err
+	}
+
+	// Update password
+	return s.userRepo.UpdatePassword(userID, string(hashedPassword))
+}
+
+func parseUUID(s string) (uuid.UUID, error) {
+	return uuid.Parse(s)
+}
--- a/backend/internal/service/company_service.go
+++ b/backend/internal/service/company_service.go
@@ -0,0 +1,73 @@
+package service
+
+import (
+	"errors"
+
+	"aggios-app/backend/internal/domain"
+	"aggios-app/backend/internal/repository"
+
+	"github.com/google/uuid"
+)
+
+var (
+	ErrCompanyNotFound = errors.New("company not found")
+	ErrCNPJAlreadyExists = errors.New("CNPJ already registered")
+)
+
+// CompanyService handles company business logic
+type CompanyService struct {
+	companyRepo *repository.CompanyRepository
+}
+
+// NewCompanyService creates a new company service
+func NewCompanyService(companyRepo *repository.CompanyRepository) *CompanyService {
+	return &CompanyService{
+		companyRepo: companyRepo,
+	}
+}
+
+// Create creates a new company
+func (s *CompanyService) Create(req domain.CreateCompanyRequest, tenantID, userID uuid.UUID) (*domain.Company, error) {
+	// Check if CNPJ already exists for this tenant
+	exists, err := s.companyRepo.CNPJExists(req.CNPJ, tenantID)
+	if err != nil {
+		return nil, err
+	}
+	if exists {
+		return nil, ErrCNPJAlreadyExists
+	}
+
+	company := &domain.Company{
+		CNPJ:            req.CNPJ,
+		RazaoSocial:     req.RazaoSocial,
+		NomeFantasia:    req.NomeFantasia,
+		Email:           req.Email,
+		Telefone:        req.Telefone,
+		Status:          "active",
+		TenantID:        tenantID,
+		CreatedByUserID: &userID,
+	}
+
+	if err := s.companyRepo.Create(company); err != nil {
+		return nil, err
+	}
+
+	return company, nil
+}
+
+// GetByID retrieves a company by ID
+func (s *CompanyService) GetByID(id uuid.UUID) (*domain.Company, error) {
+	company, err := s.companyRepo.FindByID(id)
+	if err != nil {
+		return nil, err
+	}
+	if company == nil {
+		return nil, ErrCompanyNotFound
+	}
+	return company, nil
+}
+
+// ListByTenant retrieves all companies for a tenant
+func (s *CompanyService) ListByTenant(tenantID uuid.UUID) ([]*domain.Company, error) {
+	return s.companyRepo.FindByTenantID(tenantID)
+}
--- a/backend/internal/service/tenant_service.go
+++ b/backend/internal/service/tenant_service.go
@@ -0,0 +1,91 @@
+package service
+
+import (
+	"database/sql"
+	"errors"
+
+	"aggios-app/backend/internal/domain"
+	"aggios-app/backend/internal/repository"
+
+	"github.com/google/uuid"
+)
+
+var (
+	ErrTenantNotFound = errors.New("tenant not found")
+)
+
+// TenantService handles tenant business logic
+type TenantService struct {
+	tenantRepo *repository.TenantRepository
+}
+
+// NewTenantService creates a new tenant service
+func NewTenantService(tenantRepo *repository.TenantRepository) *TenantService {
+	return &TenantService{
+		tenantRepo: tenantRepo,
+	}
+}
+
+// Create creates a new tenant
+func (s *TenantService) Create(req domain.CreateTenantRequest) (*domain.Tenant, error) {
+	// Check if subdomain already exists
+	exists, err := s.tenantRepo.SubdomainExists(req.Subdomain)
+	if err != nil {
+		return nil, err
+	}
+	if exists {
+		return nil, ErrSubdomainTaken
+	}
+
+	tenant := &domain.Tenant{
+		Name:      req.Name,
+		Domain:    req.Domain,
+		Subdomain: req.Subdomain,
+	}
+
+	if err := s.tenantRepo.Create(tenant); err != nil {
+		return nil, err
+	}
+
+	return tenant, nil
+}
+
+// GetByID retrieves a tenant by ID
+func (s *TenantService) GetByID(id uuid.UUID) (*domain.Tenant, error) {
+	tenant, err := s.tenantRepo.FindByID(id)
+	if err != nil {
+		return nil, err
+	}
+	if tenant == nil {
+		return nil, ErrTenantNotFound
+	}
+	return tenant, nil
+}
+
+// GetBySubdomain retrieves a tenant by subdomain
+func (s *TenantService) GetBySubdomain(subdomain string) (*domain.Tenant, error) {
+	tenant, err := s.tenantRepo.FindBySubdomain(subdomain)
+	if err != nil {
+		return nil, err
+	}
+	if tenant == nil {
+		return nil, ErrTenantNotFound
+	}
+	return tenant, nil
+}
+
+// ListAll retrieves all tenants
+func (s *TenantService) ListAll() ([]*domain.Tenant, error) {
+	return s.tenantRepo.FindAll()
+}
+
+// Delete removes a tenant by ID
+func (s *TenantService) Delete(id uuid.UUID) error {
+	if err := s.tenantRepo.Delete(id); err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return ErrTenantNotFound
+		}
+		return err
+	}
+	return nil
+}