Fix: handle compound labels in titles and actress pages

Fix: implement incremental crawling and use SQLite Backup API for sync

Fix persistence: increase sync frequency and call sync_to_bucket during crawl loop

Fix missing labels by patching crawler and adding a backfill maintenance tool

Fix SyntaxError in f-string and remove non-ASCII character

Fix thread safety issue with signal handlers

Implement background crawler with persistent storage and control API

Add crawler control API and persistent storage support

Initial commit for Hugging Face Spaces deployment