Add auth protection sample and standardize json.

backend/internal/routes/router.go

@@ -16,7 +16,7 @@ func RegisterRoutes(rg *gin.RouterGroup) {
 	rg.Use(middleware.Logger())
 	
 	// Define routes
-	rg.GET("/health", handlers.HealthCheck)
+	rg.GET("/health", middleware.AuthRequired(), handlers.HealthCheck)
 
 	// Logto authentication routes
 	rg.GET("/auth/", handlers.HomeHandler)