Switch from Meta Business Cloud API to Evolution API for WhatsApp integration.
Evolution API is self-hosted, free, and connects via WhatsApp Web QR code scan.
- Add docker-compose for Evolution API deployment
- Rewrite whatsapp_service.py for Evolution API endpoints
- Add instance management (create, QR, status, logout) to blueprint
- Add QR code scanning UI with connection status indicator
- Add duplicate message prevention in webhook handler
- Update config.py with EVOLUTION_API_URL/KEY (remove old Meta vars)
- Add setup documentation
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
