v1.4: Segurança multi-tenant, file serving via API e UX humanizada

-  Validação cross-tenant no login e rotas protegidas
-  File serving via /api/files/{bucket}/{path} (eliminação DNS)
-  Mensagens de erro humanizadas inline (sem pop-ups)
-  Middleware tenant detection via headers customizados
-  Upload de logos retorna URLs via API
-  README atualizado com changelog v1.4 completo

front-end-agency/next.config.ts

@@ -1,6 +1,7 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
+  reactStrictMode: false, // Desabilitar StrictMode para evitar double render que causa removeChild
   experimental: {
     externalDir: true,
   },
@@ -23,6 +24,10 @@ const nextConfig: NextConfig = {
             key: "X-Forwarded-For",
             value: "127.0.0.1",
           },
+          {
+            key: "X-Forwarded-Host",
+            value: "${host}",
+          },
         ],
       },
     ];