fix: 修复HTTP协议视频下载完成后状态未更新的问题

- 在HTTP协议处理中添加volume_cache_path设置
- 确保下载成功后状态正确更新为ready
- 添加process_span.set_status("success")标记成功状态

修复问题:
- 文件下载完成但status仍为downloading
- local_exists为true但local_available为false
- 状态更新逻辑因缺少volume_cache_path而失效

src/cluster/video_apps/cache_submit.py

@@ -193,6 +193,8 @@ with downloader_image.imports():
                                 cache_filepath = f"{config.S3_mount_dir}/{media.cache_filepath}"
                                 os.makedirs(os.path.dirname(cache_filepath), exist_ok=True)
                                 download_large_file(url=media.__str__(), output_path=cache_filepath)
+                                volume_cache_path = cache_filepath  # 设置volume_cache_path用于状态更新
+                                process_span.set_status("success")
                             except Exception as e:
                                 logger.exception(e)
                                 media.status = MediaCacheStatus.failed