feat: add error handling to player creation and update gitignore for agent

.env.example

@@ -0,0 +1,10 @@
+# Database
+DATABASE_URL="postgresql://postgres:postgres@localhost:5432/temfut?schema=public"
+
+# NextAuth
+NEXTAUTH_URL="http://temfut.localhost"
+NEXTAUTH_SECRET="your-secret-here"
+
+# App
+PORT=3000
+SKIP_ENV_VALIDATION=true