Add webhook endpoints to receive events from Odoo (sale orders, stock
picking, invoices) and send WhatsApp notifications when orders are
confirmed, shipped, or payments are received.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Add bidirectional contact synchronization between WhatsApp Central and Odoo,
including sync endpoints and ContactSyncService.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>