Restore samples.json loading for AI drawing

Fix AI toggle no-op, add (beta) label

Fix health check: use PORT 7860 to match HF Spaces default, add /health endpoint

Optimize HF Space startup: fix port, add .dockerignore, remove unused samples.json load

Remove AI player and QuickDraw recognition

Replace admin system with TOTP mod system, defer QuickDraw model loading, fix teams-mode sync, add AI-only-when-alone guard

Initial commit: Skrawl multiplayer drawing game with QuickDraw AI recognition