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.

app/scheduler/jobs.py

@@ -1,7 +1,9 @@
 import logging
+
 from apscheduler.schedulers.asyncio import AsyncIOScheduler
-from app.config import settings
+
 from app.api.deps import get_crawl_service
+from app.config import settings
 
 logger = logging.getLogger(__name__)
 scheduler = AsyncIOScheduler()