chore: ruff lint 修复 + 第一优先级全部完成

tests/test_auth.py

@@ -1,11 +1,11 @@
 """认证与速率限制测试."""
-import time
 import threading
+import time
 
 import pytest
 from fastapi import HTTPException
 
-from src.server.auth import verify_api_key, RateLimiter
+from src.server.auth import RateLimiter, verify_api_key
 
 
 class TestVerifyApiKey: