refactor(cleaner): 移除未使用的存储删除接口

清理任务时不再调用 Storage.DeleteByTask 方法，因为当前 OSS 服务暂未提供删除接口。
从 StorageService 接口和 ossStorage 实现中移除 DeleteByTask 方法，并更新清理逻辑。

service/cleaner.go

@@ -45,7 +45,6 @@ func (c *cleaner) runOnce(ctx context.Context) {
 		g.Log().Errorf(ctx, "[cleaner] list expired(downloaded) error: %v", err)
 	} else {
 		for _, t := range expired {
-			_ = Storage.DeleteByTask(ctx, t)
 			_ = dao.Task.HardDeleteByIDGlobal(ctx, t.Id)
 		}
 		g.Log().Infof(ctx, "[cleaner] expired(downloaded) cleaned, count=%d", len(expired))
@@ -77,13 +76,12 @@ func (c *cleaner) runOnce(ctx context.Context) {
 		g.Log().Infof(ctx, "[cleaner] failed retryable cleaned, count=%d", len(retryable))
 	}
 
-	// 4) 超过重试次数仍失败(state=3)的任务：硬删除 + OSS
+	// 4) 超过重试次数仍失败(state=3)的任务：硬删除
 	exhausted, err := dao.Task.ListFailedExhaustedGlobal(ctx, 200)
 	if err != nil {
 		g.Log().Errorf(ctx, "[cleaner] list failed exhausted error: %v", err)
 	} else {
 		for _, t := range exhausted {
-			_ = Storage.DeleteByTask(ctx, t)
 			_ = dao.Task.HardDeleteByIDGlobal(ctx, t.Id)
 		}
 		g.Log().Infof(ctx, "[cleaner] failed exhausted cleaned, count=%d", len(exhausted))