fix(upload): 分片上传 - 先预留配额并原子提交容量 (#679)

Co-authored-by: ddcat666 <26564566+ddcat666@users.noreply.github.com>

backend/internal/app/task_media_storage.go

@@ -266,7 +266,7 @@ func (s *Service) storeTaskMediaFile(task *model.Task, index int, path, mimeType
 		resource.ETag, err = s.storeTaskMediaObject(resource, "generated."+extensionFromMimeType(mimeType), file)
 		if err == nil {
 			resource.Status, resource.Error, resource.UpdatedAt = model.ResourceStatusReady, "", time.Now()
-			err = s.repo.SaveResource(resource)
+			err = s.saveResourceWithinStorageLimit(resource, "")
 		}
 	}
 	if err != nil {