chore: cleanup auth code after debugging session

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/auth/service.py

@@ -3,6 +3,7 @@ Authentication Service
 
 Business logic for user synchronization from Authentik.
 """
+import re
 import uuid
 from datetime import datetime, timezone
 from typing import Optional
@@ -251,7 +252,6 @@ class AuthService:
 
     def _extract_cookie(self, headers: httpx.Headers, cookie_name: str) -> str:
         """Extract a specific cookie value from Set-Cookie headers"""
-        import re
         for header in headers.get_list('set-cookie'):
             if header.startswith(f'{cookie_name}='):
                 match = re.match(rf'{cookie_name}=([^;]+)', header)