fix: ensure stop_streaming waits for inflight initial flush before final edit; improve message edit/delete return types and logging

- Update stop_streaming logic to await inflight initial flush task, preventing duplicate message sends on stream stop
- Change message edit/delete methods to return Optional[bool] for clearer channel mismatch handling
- Refine Feishu logging to include message_id instead of full data object
- Suppress allowed_objects warnings in __init__.py
- Add test to verify stop_streaming waits for inflight flush before final edit
- Update .pylintrc to use 'E' for error enabling

.pylintrc

@@ -18,7 +18,7 @@ jobs=0
 
 # 禁用大部分警告、约定和重构建议，只保留错误和重要警告
 disable=all
-enable=error,
+enable=E,
        syntax-error,
        undefined-variable,
        used-before-assignment,