feat(channel): enhance channel service with caching and repository updates

- Updated ChannelService to include caching for channel lists, improving performance and reducing database load.
- Introduced cache invalidation methods to ensure channel list consistency after modifications.
- Modified ChannelRepository to remove unused ListByIDs method, streamlining the repository interface.
- Updated wire generation to inject cache into ChannelService for enhanced functionality.
- Added new cache key constants for channel-related data management.

internal/repository/channel_repo.go

@@ -48,19 +48,6 @@ func (r *ChannelRepository) GetByID(id string) (*model.Channel, error) {
 	return &channel, nil
 }
 
-// ListByIDs 按 ID 列表查询频道（用于帖子列表批量填充 channel 名称）
-func (r *ChannelRepository) ListByIDs(ids []string) ([]*model.Channel, error) {
-	if len(ids) == 0 {
-		return nil, nil
-	}
-	var list []*model.Channel
-	err := r.db.Where("id IN ?", ids).Find(&list).Error
-	if err != nil {
-		return nil, err
-	}
-	return list, nil
-}
-
 func (r *ChannelRepository) Delete(id string) error {
 	return r.db.Delete(&model.Channel{}, "id = ?", id).Error
 }