fix(用户): 使用事务安全处理邮箱绑定更新

在更新用户绑定邮箱逻辑中引入事务处理，确保在并发情况下数据一致性。新增事务内检查记录存在性，避免重复插入或更新冲突。

internal/logic/public/user/updateBindEmailLogic.go

@@ -48,22 +48,47 @@ func (l *UpdateBindEmailLogic) UpdateBindEmail(req *types.UpdateBindEmailRequest
 	if m.Id > 0 {
 		return errors.Wrapf(xerr.NewErrCode(xerr.UserExist), "email already bind")
 	}
-	if method.Id == 0 {
-		method = &user.AuthMethods{
-			UserId:         u.Id,
-			AuthType:       "email",
-			AuthIdentifier: req.Email,
-			Verified:       false,
-		}
-		if err := l.svcCtx.UserModel.InsertUserAuthMethods(l.ctx, method); err != nil {
-			return errors.Wrapf(xerr.NewErrCode(xerr.DatabaseInsertError), "InsertUserAuthMethods error")
-		}
-	} else {
-		method.Verified = false
-		method.AuthIdentifier = req.Email
-		if err := l.svcCtx.UserModel.UpdateUserAuthMethods(l.ctx, method); err != nil {
-			return errors.Wrapf(xerr.NewErrCode(xerr.DatabaseUpdateError), "UpdateUserAuthMethods error")
+	// Use transaction to safely handle insert or update
+	err = l.svcCtx.UserModel.Transaction(l.ctx, func(db *gorm.DB) error {
+		if method.Id == 0 {
+			// Check if record exists in current transaction
+			var existingMethod user.AuthMethods
+			err := db.Model(&user.AuthMethods{}).Where("user_id = ? AND auth_type = ?", u.Id, "email").First(&existingMethod).Error
+			if err != nil {
+				if errors.Is(err, gorm.ErrRecordNotFound) {
+					// Create new record
+					method = &user.AuthMethods{
+						UserId:         u.Id,
+						AuthType:       "email",
+						AuthIdentifier: req.Email,
+						Verified:       false,
+					}
+					if err := db.Create(method).Error; err != nil {
+						return err
+					}
+				} else {
+					return err
+				}
+			} else {
+				// Record exists, update it
+				existingMethod.AuthIdentifier = req.Email
+				existingMethod.Verified = false
+				if err := db.Save(&existingMethod).Error; err != nil {
+					return err
+				}
+			}
+		} else {
+			// Update existing record
+			method.Verified = false
+			method.AuthIdentifier = req.Email
+			if err := db.Save(method).Error; err != nil {
+				return err
+			}
 		}
+		return nil
+	})
+	if err != nil {
+		return errors.Wrapf(xerr.NewErrCode(xerr.DatabaseInsertError), "UpdateBindEmail transaction error")
 	}
 	return nil
 }