v2.1.0 - Admin Endpoint + Backup System

✨ Features:
- Admin endpoint with 6 protected actions
- Complete backup/restore system
- Admin testing UI
- Security with password authentication

📦 Stats:
- 1,354 lines added
- 6 files created/modified
- Complete documentation

🔒 Security:
- Password-protected operations
- Server-side validation
- Private config in .private/

🤖 Generated with Claude Code

ChessArcade v2.0.0 - Global Leaderboard Release

🎉 Primera versión con sistema de leaderboard global completo!

Features:
- Leaderboard global funcionando en www.chessarcade.com.ar
- Backend en Vercel + Supabase PostgreSQL
- Frontend completo con modal, tabs, paginación
- Test page para debugging
- 4 documentos completos de referencia

Sprint 3 completado exitosamente.
Next: Sprint 4 - Game Integration

🤖 Generated with Claude Code