refactor: 文件行数超标拆解（Service + Controller 9/16 完成）

- Service 层：energy_service → energize/operations/admin/query 四文件
- Service 层：post_service → helpers/audit + 核心 CRUD 保留
- Service 层：favorite_service → items + 核心文件夹操作保留
- Service 层：auth_service → password + 核心注册/登录保留
- Service 层：notification_service → notify + 核心列表/已读保留
- Service 层：audit_service → review + 核心列表/详情保留
- Controller 层：studio_controller → page/write/api/post_api/action 五文件
- Controller 层：post_controller → page/api/upload 三文件
- Controller 层：comment_controller → list/write/action/upload 四文件
- 清理未使用导入（notification_service.go 移除 fmt）

internal/service/favorite_service.go

@@ -206,124 +206,6 @@ func (s *FavoriteService) DeleteFolder(userID, folderID uint) error {
 	})
 }
 
-// AddToFolder 将文章加入收藏夹（会先移除该文章在其他收藏夹的收藏）
-func (s *FavoriteService) AddToFolder(userID, folderID, postID uint) error {
-	// 检查收藏夹归属
-	f, err := s.repo.FindFolderByID(folderID)
-	if err != nil {
-		return common.ErrPostNotFound
-	}
-	if f.UserID != userID {
-		return common.ErrPermissionDenied
-	}
-
-	return s.db.Transaction(func(tx *gorm.DB) error {
-		txRepo := s.repo.WithTx(tx)
-
-		// 如果该文章已在其他收藏夹中，先移除
-		existing, err := txRepo.FindItemByUserAndPost(userID, postID)
-		if err == nil && existing.FolderID != folderID {
-			if err := txRepo.DeleteItem(existing.FolderID, postID); err != nil {
-				return fmt.Errorf("移除旧收藏: %w", err)
-			}
-			// 旧收藏夹没有增加计数，所以不需要减
-		}
-
-		// 检查是否已在目标收藏夹中
-		if err == nil && existing.FolderID == folderID {
-			return fmt.Errorf("文章已在此收藏夹中")
-		}
-
-		item := &model.FolderItem{
-			FolderID: folderID,
-			PostID:   postID,
-			UserID:   userID,
-		}
-		if err := txRepo.CreateItem(item); err != nil {
-			return fmt.Errorf("添加收藏: %w", err)
-		}
-
-		return txRepo.IncrPostFavoritesCount(postID, 1)
-	})
-}
-
-// RemoveFromFolder 从收藏夹移除文章
-func (s *FavoriteService) RemoveFromFolder(userID, folderID, postID uint) error {
-	f, err := s.repo.FindFolderByID(folderID)
-	if err != nil {
-		return common.ErrPostNotFound
-	}
-	if f.UserID != userID {
-		return common.ErrPermissionDenied
-	}
-
-	return s.db.Transaction(func(tx *gorm.DB) error {
-		txRepo := s.repo.WithTx(tx)
-		if err := txRepo.DeleteItem(folderID, postID); err != nil {
-			return fmt.Errorf("移除收藏: %w", err)
-		}
-		return txRepo.IncrPostFavoritesCount(postID, -1)
-	})
-}
-
-// AddFavorite 收藏文章（自动选择或创建默认收藏夹）
-func (s *FavoriteService) AddFavorite(userID, postID uint, folderID *uint) error {
-	var targetFolderID uint
-
-	if folderID != nil && *folderID > 0 {
-		targetFolderID = *folderID
-	} else {
-		// 使用或创建默认收藏夹
-		f, err := s.ensureDefaultFolder(userID)
-		if err != nil {
-			return err
-		}
-		targetFolderID = f.ID
-	}
-
-	return s.AddToFolder(userID, targetFolderID, postID)
-}
-
-// RemoveFavorite 取消收藏文章
-func (s *FavoriteService) RemoveFavorite(userID, postID uint) error {
-	existing, err := s.repo.FindItemByUserAndPost(userID, postID)
-	if err != nil {
-		return fmt.Errorf("未收藏该文章")
-	}
-	return s.RemoveFromFolder(userID, existing.FolderID, postID)
-}
-
-// ListFolderItems 列收藏夹内的文章
-func (s *FavoriteService) ListFolderItems(userID, folderID uint, page, pageSize int) (*FolderItemsResult, error) {
-	f, err := s.repo.FindFolderByID(folderID)
-	if err != nil {
-		return nil, common.ErrPostNotFound
-	}
-
-	// 权限检查：非本人 + 非公开 → 拒绝
-	if f.UserID != userID && !f.IsPublic {
-		return nil, common.ErrPermissionDenied
-	}
-
-	p := common.Pagination{Page: page, PageSize: pageSize}
-	p.DefaultPagination()
-
-	items, total, err := s.repo.ListItemsByFolder(folderID, p.Offset(), p.PageSize)
-	if err != nil {
-		return nil, fmt.Errorf("查询收藏内容: %w", err)
-	}
-	if items == nil {
-		items = []model.FolderItem{}
-	}
-
-	return &FolderItemsResult{
-		Items:      items,
-		Total:      total,
-		Page:       p.Page,
-		TotalPages: common.PageCount(total, p.PageSize),
-	}, nil
-}
-
 // GetPostFavoriteStatus 查询文章收藏状态
 func (s *FavoriteService) GetPostFavoriteStatus(userID, postID uint) (*FavoriteStatus, error) {
 	item, err := s.repo.FindItemByUserAndPost(userID, postID)
@@ -343,21 +225,3 @@ func (s *FavoriteService) GetPostFavoriteStatus(userID, postID uint) (*FavoriteS
 		FolderName: folderName,
 	}, nil
 }
-
-// ToggleFavorite 切换收藏（有则取消，无则加入默认收藏夹）
-func (s *FavoriteService) ToggleFavorite(userID, postID uint) (bool, error) {
-	existing, err := s.repo.FindItemByUserAndPost(userID, postID)
-	if err == nil {
-		// 已收藏，取消
-		if err := s.RemoveFromFolder(userID, existing.FolderID, postID); err != nil {
-			return false, err
-		}
-		return false, nil
-	}
-
-	// 未收藏，加入默认
-	if err := s.AddFavorite(userID, postID, nil); err != nil {
-		return false, err
-	}
-	return true, nil
-}