fix: Update OSS imports to use relative imports within modules

src/oss/oss_submission_handler.py

@@ -11,9 +11,8 @@ from datetime import datetime
 from pathlib import Path
 from typing import Dict, Any
 
-# 添加上级目录到路径以导入oss_file_manager
-sys.path.append(os.path.join(os.path.dirname(__file__), '..', 'spaces'))
-from oss_file_manager import OSSFileManager
+# 导入同目录下的oss_file_manager
+from .oss_file_manager import OSSFileManager
 
 class OSSSubmissionHandler:
     """OSS提交处理器 - 将用户提交直接上传到OSS"""