Re-migrate code

AGENTS.md

@@ -125,7 +125,7 @@ func (s *AuthService) ValidateUser(username, password string) (models.User, erro
     var user models.User
     err := database.DB.Where("username = ?", username).First(&user).Error
     if err != nil {
-        return models.User{}, errors.New("用户名或密码错误")
+        return models.User{}, errors.New("用户名或密码不正确")
     }
     return user, nil
 }
@@ -149,6 +149,9 @@ func (c *AuthController) Login(ctx *gin.Context) {
 }
 ```
 
+- Use `ErrorResponse` for API errors so messages are user-friendly and consistent.
+- Do not leak raw DB/stack errors to clients; log internal details and return safe messages.
+
 ### Response Format
 **Success response**:
 ```json
@@ -158,6 +161,8 @@ func (c *AuthController) Login(ctx *gin.Context) {
 }
 ```
 
+Some endpoints also return Node-compatible top-level keys (e.g. `serial`, `serials`, `pagination`) to preserve frontend compatibility.
+
 **Error response**:
 ```json
 {