{"message":"Luogu Problems API","description":"Programming problems API with auto-resume crawl capability","endpoints":{"GET /api/all":"Get all problems","GET /api/crawl-status":"Get crawl progress and status","GET /api/cron":"Start/reset crawl job (Cron only)","GET /api/crawl-page":"Crawl single page (Cron auto-trigger)","GET /api/health":"Health check"},"features":["Auto-resume on timeout","Page-by-page crawling","Progress tracking","No duplicate crawling"]}