增加站内信未读提醒和后台通知中心+txt 校验

backend/internal/modules/notification/service.go

@@ -6,6 +6,7 @@ import (
 )
 
 var ErrDependencyUnavailable = errors.New("dependency unavailable")
+var ErrNotificationNotFound = errors.New("notification not found")
 
 type Service struct {
 	repo *Repository
@@ -28,3 +29,21 @@ func (s *Service) MarkRead(ctx context.Context, userID uint64, id uint64) error
 	}
 	return s.repo.MarkRead(ctx, userID, id)
 }
+
+func (s *Service) UnreadCount(ctx context.Context, userID uint64) (*UnreadCountDTO, error) {
+	if s.repo == nil {
+		return nil, ErrDependencyUnavailable
+	}
+	count, err := s.repo.UnreadCount(ctx, userID)
+	if err != nil {
+		return nil, err
+	}
+	return &UnreadCountDTO{UnreadCount: count}, nil
+}
+
+func (s *Service) MarkAllRead(ctx context.Context, userID uint64) (int64, error) {
+	if s.repo == nil {
+		return 0, ErrDependencyUnavailable
+	}
+	return s.repo.MarkAllRead(ctx, userID)
+}