fix: 评论系统全量检查修复（7 项 Gap 全部修复）

- Delete 权限：新增 requesterID/isAdmin 参数，Service 层鉴权（仅本人/管理员可删）
- 通知内容：改用 GetUsernameByID 显示真实用户名，非数字 UID
- SearchUsers：Repository 返回 exp，Service 调用 GetLevelByExp 计算等级
- 通知高亮：Notification 新增 CommentID 字段，消息链接支持 #comment-{id}
- 已删除提示：前端 hash 检测 + 3 秒超时 Toast "该评论已不存在"
- Admin CSS：移除不存在的 comments.css 引用
- 错误哨兵：改用 common.ErrCommentNotFound/ErrCommentEmpty/PermissionDenied

internal/service/comment_service.go

@@ -28,7 +28,7 @@ func NewCommentService(repo commentStore, notifier commentNotifier) *CommentServ
 // CreateRoot 创建顶级评论
 func (s *CommentService) CreateRoot(userID uint, postID uint, body string) (*model.Comment, error) {
 	if strings.TrimSpace(body) == "" {
-		return nil, errors.New("评论内容不能为空")
+		return nil, common.ErrCommentEmpty
 	}
 
 	postAuthorID, err := s.repo.FindPostAuthorID(postID)
@@ -60,11 +60,14 @@ func (s *CommentService) CreateRoot(userID uint, postID uint, body string) (*mod
 
 	// 通知文章作者（评论者 ≠ 作者），RelatedID 存 postID 以便消息页生成跳转链接
 	if s.notifier != nil && userID != postAuthorID {
-		commenterUID, _ := s.repo.GetUserUIDByID(userID)
+		commenterName, _ := s.repo.GetUsernameByID(userID)
+		if commenterName == "" {
+			commenterName = "用户"
+		}
 		s.notifier.Create(postAuthorID, model.NotifyComment,
 			"新评论",
-			fmt.Sprintf("%s 评论了你的文章", commenterUID),
-			&comment.PostID)
+			fmt.Sprintf("%s 评论了你的文章", commenterName),
+			&comment.PostID, &comment.ID)
 	}
 
 	return comment, nil
@@ -73,13 +76,13 @@ func (s *CommentService) CreateRoot(userID uint, postID uint, body string) (*mod
 // CreateReply 创建回复
 func (s *CommentService) CreateReply(userID uint, parentID uint, body string) (*model.Comment, error) {
 	if strings.TrimSpace(body) == "" {
-		return nil, errors.New("回复内容不能为空")
+		return nil, common.ErrCommentEmpty
 	}
 
 	parent, err := s.repo.FindByID(parentID)
 	if err != nil {
 		if errors.Is(err, gorm.ErrRecordNotFound) {
-			return nil, errors.New("父评论不存在")
+			return nil, common.ErrCommentNotFound
 		}
 		return nil, fmt.Errorf("查询父评论失败: %w", err)
 	}
@@ -108,22 +111,25 @@ func (s *CommentService) CreateReply(userID uint, parentID uint, body string) (*
 
 	// 通知被回复者（不自己回复自己），RelatedID 存 postID 以便消息页生成跳转链接
 	if s.notifier != nil && parent.UserID != userID {
-		commenterUID, _ := s.repo.GetUserUIDByID(userID)
+		commenterName, _ := s.repo.GetUsernameByID(userID)
+		if commenterName == "" {
+			commenterName = "用户"
+		}
 		s.notifier.Create(parent.UserID, model.NotifyCommentReply,
 			"新回复",
-			fmt.Sprintf("%s 回复了你的评论", commenterUID),
-			&parent.PostID)
+			fmt.Sprintf("%s 回复了你的评论", commenterName),
+			&parent.PostID, &comment.ID)
 	}
 
 	return comment, nil
 }
 
-// Delete 软删除评论
-func (s *CommentService) Delete(commentID uint) error {
+// Delete 软删除评论（requesterID 为请求者，isAdmin 表示是否为管理员）
+func (s *CommentService) Delete(commentID uint, requesterID uint, isAdmin bool) error {
 	comment, err := s.repo.FindByID(commentID)
 	if err != nil {
 		if errors.Is(err, gorm.ErrRecordNotFound) {
-			return errors.New("评论不存在")
+			return common.ErrCommentNotFound
 		}
 		return fmt.Errorf("查询评论失败: %w", err)
 	}
@@ -132,6 +138,11 @@ func (s *CommentService) Delete(commentID uint) error {
 		return nil
 	}
 
+	// 权限检查：仅本人或管理员可删除
+	if !isAdmin && comment.UserID != requesterID {
+		return common.ErrPermissionDenied
+	}
+
 	if err := s.repo.SoftDelete(commentID); err != nil {
 		return fmt.Errorf("删除评论失败: %w", err)
 	}
@@ -182,7 +193,7 @@ func (s *CommentService) SearchUsers(keyword string) ([]model.UserSearchResult,
 		users[i] = model.UserSearchResult{
 			UID:      row.UID,
 			Username: row.Username,
-			Level:    0,
+			Level:    model.GetLevelByExp(row.Exp),
 		}
 	}
 	return users, nil

internal/service/level_service.go

@@ -84,7 +84,7 @@ func (s *LevelService) AddExp(userID uint, delta int) (newExp int, levelUp bool,
 			_ = s.notifSvc.Create(userID, model.NotifyLevelUp,
 				"等级提升",
 				fmt.Sprintf("恭喜您！您的等级已提升至 %s", model.GetLevelName(newLevel)),
-				nil)
+				nil, nil)
 		}
 	}
 

internal/service/notification_service.go

@@ -26,7 +26,7 @@ func NewNotificationService(repo notifRepo) *NotificationService {
 }
 
 // Create 创建消息
-func (s *NotificationService) Create(userID uint, notifyType, title, content string, relatedID *uint) error {
+func (s *NotificationService) Create(userID uint, notifyType, title, content string, relatedID, commentID *uint) error {
 	n := &model.Notification{
 		UserID:     userID,
 		NotifyType: notifyType,
@@ -34,6 +34,7 @@ func (s *NotificationService) Create(userID uint, notifyType, title, content str
 		Content:    content,
 		IsRead:     false,
 		RelatedID:  relatedID,
+		CommentID:  commentID,
 	}
 	return s.repo.Create(n)
 }
@@ -92,7 +93,7 @@ func (s *NotificationService) NotifyAuditApproved(userID uint, auditType string,
 	_ = s.Create(userID, model.NotifyAuditApproved,
 		"审核已通过",
 		"你的"+typeName+"修改已通过审核",
-		&relatedID)
+		&relatedID, nil)
 }
 
 // NotifyAuditRejected 审核拒绝通知
@@ -108,14 +109,14 @@ func (s *NotificationService) NotifyAuditRejected(userID uint, auditType, reason
 	_ = s.Create(userID, model.NotifyAuditRejected,
 		"审核未通过",
 		content,
-		&relatedID)
+		&relatedID, nil)
 }
 
 // NotifyPostApproved 稿件审核通过通知
 func (s *NotificationService) NotifyPostApproved(userID uint, postTitle string, postID uint) {
 	title := "稿件审核通过"
 	content := "你的稿件《" + postTitle + "》已通过审核，现已公开发布"
-	_ = s.Create(userID, model.NotifyPostApproved, title, content, &postID)
+	_ = s.Create(userID, model.NotifyPostApproved, title, content, &postID, nil)
 }
 
 // NotifyPostRejected 稿件审核拒绝通知
@@ -125,5 +126,5 @@ func (s *NotificationService) NotifyPostRejected(userID uint, postTitle, reason
 	if reason != "" {
 		content += "，理由：" + reason
 	}
-	_ = s.Create(userID, model.NotifyPostRejected, title, content, &postID)
+	_ = s.Create(userID, model.NotifyPostRejected, title, content, &postID, nil)
 }

internal/service/repository.go

@@ -86,7 +86,7 @@ type taskStore interface {
 
 // levelNotifier 等级升级通知接口
 type levelNotifier interface {
-	Create(userID uint, notifyType, title, content string, relatedID *uint) error
+	Create(userID uint, notifyType, title, content string, relatedID, commentID *uint) error
 }
 
 // EnergyStore EnergyService 所需的完整仓储接口
@@ -113,7 +113,7 @@ type energyStore = EnergyStore
 
 // energyNotifier EnergyService 所需的通知接口（ISP）
 type energyNotifier interface {
-	Create(userID uint, notifyType, title, content string, relatedID *uint) error
+	Create(userID uint, notifyType, title, content string, relatedID, commentID *uint) error
 }
 
 // commentStore CommentService 所需的最小仓储接口（ISP）
@@ -132,12 +132,14 @@ type commentStore interface {
 	SearchUsersByLevel(keyword string, minLevel, limit int) ([]struct {
 		UID      string
 		Username string
+		Exp      int
 	}, error)
 	GetUserUIDByID(userID uint) (string, error)
+	GetUsernameByID(userID uint) (string, error)
 	ListAllComments(keyword string, showDeleted bool, offset, limit int) ([]model.AdminCommentRow, int64, error)
 }
 
 // commentNotifier CommentService 所需的通知接口（ISP）
 type commentNotifier interface {
-	Create(userID uint, notifyType, title, content string, relatedID *uint) error
+	Create(userID uint, notifyType, title, content string, relatedID, commentID *uint) error
 }