Full messaging hub that instances call via API to send WhatsApp messages:
- Meta Graph API v25.0 integration (text, template, image, document)
- API endpoint POST /api/messaging/send (auth via X-Messaging-Key header)
- Per-instance API keys with rate limiting
- WhatsApp webhook for delivery status updates
- Admin UI: dashboard stats, compose, message log, API key management
- Sidebar nav integration
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>