backend: remove register and admin user management routes

- Remove /api/auth/register endpoint
- Remove /api/admin/users CRUD routes
- Simplify router to only keep auth/login and health endpoints

backend/internal/router/router.go

@@ -22,30 +22,13 @@ func Setup(cfg *config.Config) *gin.Engine {
 
 	authHandler := handler.NewAuthHandler(userService)
 	healthHandler := handler.NewHealthHandler(db.DB)
-	adminHandler := handler.NewAdminHandler(userService)
 
 	// Public routes
-	r.POST("/api/auth/register", authHandler.Register)
 	r.POST("/api/auth/local-login", authHandler.LocalLogin)
 	r.POST("/api/auth/lookup-binding", authHandler.LookupBinding)
 	r.POST("/api/auth/bind-keycloak", authHandler.BindKeycloak)
 	r.POST("/api/auth/init", authHandler.InitAdmin)
 	r.GET("/api/health", healthHandler.Check)
 
-	// Protected routes
-	api := r.Group("/api")
-	api.Use(middleware.AuthProxy())
-	{
-	}
-
-	// Admin routes
-	admin := api.Group("/admin")
-	admin.Use(middleware.RequireRole("admin"))
-	{
-		admin.GET("/users", adminHandler.ListUsers)
-		admin.POST("/users", adminHandler.CreateUser)
-		admin.DELETE("/users/:id", adminHandler.DeleteUser)
-	}
-
 	return r
 }