优化代码格式和异常处理

- 修复异常处理链，使用from语法保留原始异常
- 格式化代码以符合项目规范
- 优化导入模块的顺序

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/plugins/chat/message.py

@@ -9,8 +9,8 @@ import urllib3
 
 from .utils_image import image_manager
 
-from .message_base import Seg, GroupInfo, UserInfo, BaseMessageInfo, MessageBase
-from .chat_stream import ChatStream, chat_manager
+from .message_base import Seg, UserInfo, BaseMessageInfo, MessageBase
+from .chat_stream import ChatStream
 from src.common.logger import get_module_logger
 
 logger = get_module_logger("chat_message")