执行 Ruff 安全自动修复

tests/test_douyu_elite_exchange_flow.py

@@ -1,9 +1,9 @@
 """精英手册兑换：csrf 复用、新链路接口与浏览器状态机路由的测试。"""
 
-import pytest
-
 from unittest.mock import Mock, call
 
+import pytest
+
 from core.douyu.activity_client import DouyuActivityClient, DouyuActivityError