fix: improve maintenance and synchronize live conversations

backend/tests/services/test_faq_article_import.py

@@ -17,8 +17,7 @@ Article-mode import tests: link discovery bounds, HTML→Markdown conversion
 (link absolutization, image placeholder/re-host, data: skip), and the
 end-to-end job with mocked fetches.
 """
-from types import SimpleNamespace
-from unittest.mock import AsyncMock, MagicMock, patch
+from unittest.mock import MagicMock, patch
 from urllib.parse import urlparse
 
 import pytest