chore: ruff 代码检查与修复

130 issues auto-fixed (import ordering, UP045/UP006 type annotations),
33 issues manually fixed (E712/E501/E402/E722 + N818 rename + per-file
wechat ignore for N8xx naming conventions). All 33 tests pass.

tests/test_crawler/test_parsers.py

@@ -1,8 +1,9 @@
 from datetime import datetime
+
 from app.crawler.parsers import (
-    parse_gxgp_api_response,
-    parse_dahuagov_html,
     extract_pagination,
+    parse_dahuagov_html,
+    parse_gxgp_api_response,
 )