chore: 调整存储和日志模块

- oss_storage: 暂时使用本地存储，OSS 代码注释保留
- logger: 优化日志配置

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/utils/logger.py

@@ -1,6 +1,9 @@
 import logging
 import sys
 from datetime import datetime
+from pathlib import Path
+
+from app.config import settings
 
 
 def setup_logger():