接口跑通，基础功能全部实现

backend/signin_executor/app/main.py

@@ -19,6 +19,8 @@ from app.services.signin_service import SignInService
 from app.services.weibo_client import WeiboClient
 from app.models.signin_models import SignInRequest, SignInResult, TaskStatus
 
+logger = logging.getLogger(__name__)
+
 # Initialize FastAPI app
 app = FastAPI(
     title="Weibo-HotSign Sign-in Executor",