feat(integrations): add contact sync service

Add bidirectional contact synchronization between WhatsApp Central and Odoo,
including sync endpoints and ContactSyncService.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

services/integrations/app/routers/__init__.py

@@ -1,3 +1,4 @@
 from app.routers.odoo import router as odoo_router
+from app.routers.sync import router as sync_router
 
-__all__ = ["odoo_router"]
+__all__ = ["odoo_router", "sync_router"]

services/integrations/app/routers/sync.py

@@ -0,0 +1,48 @@
+from fastapi import APIRouter, HTTPException
+from pydantic import BaseModel
+from typing import Optional
+from app.services.sync import ContactSyncService
+
+router = APIRouter(prefix="/api/sync", tags=["sync"])
+
+
+class SyncContactRequest(BaseModel):
+    contact_id: str
+    phone: str
+    name: Optional[str] = None
+    email: Optional[str] = None
+
+
+@router.post("/contact-to-odoo")
+async def sync_contact_to_odoo(request: SyncContactRequest):
+    """Sync WhatsApp contact to Odoo partner"""
+    try:
+        service = ContactSyncService()
+        partner_id = await service.sync_contact_to_odoo(
+            contact_id=request.contact_id,
+            phone=request.phone,
+            name=request.name,
+            email=request.email,
+        )
+
+        if partner_id:
+            return {"success": True, "odoo_partner_id": partner_id}
+        raise HTTPException(500, "Failed to sync contact")
+    except Exception as e:
+        raise HTTPException(500, str(e))
+
+
+@router.post("/partner-to-contact/{partner_id}")
+async def sync_partner_to_contact(partner_id: int):
+    """Sync Odoo partner to WhatsApp contact"""
+    try:
+        service = ContactSyncService()
+        contact_id = await service.sync_partner_to_contact(partner_id)
+
+        return {
+            "success": True,
+            "contact_id": contact_id,
+            "message": "Contact found" if contact_id else "No matching contact",
+        }
+    except Exception as e:
+        raise HTTPException(500, str(e))