fix(sync): customer_name reflects invoice partner (company or shipping person)

When billing is on a company, customer_name now uses billing.company_name
instead of shipping person name. This aligns SQLite customer_name with the
partner created in ROA by import_service, making order-invoice correlation
possible in the dashboard.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/app/services/sync_service.py

@@ -78,14 +78,21 @@ async def prepare_sync(id_pol: int = None, id_sectie: int = None) -> dict:
 
 
 def _derive_customer_info(order):
-    """Extract shipping/billing names and customer from an order."""
+    """Extract shipping/billing names and customer from an order.
+    customer = who appears on the invoice (partner in ROA):
+      - company name if billing is on a company
+      - shipping person name otherwise (consistent with import_service partner logic)
+    """
     shipping_name = ""
     if order.shipping:
         shipping_name = f"{getattr(order.shipping, 'firstname', '') or ''} {getattr(order.shipping, 'lastname', '') or ''}".strip()
     billing_name = f"{getattr(order.billing, 'firstname', '') or ''} {getattr(order.billing, 'lastname', '') or ''}".strip()
     if not shipping_name:
         shipping_name = billing_name
-    customer = shipping_name or order.billing.company_name or billing_name
+    if order.billing.is_company and order.billing.company_name:
+        customer = order.billing.company_name
+    else:
+        customer = shipping_name or billing_name
     payment_method = getattr(order, 'payment_name', None) or None
     delivery_method = getattr(order, 'delivery_name', None) or None
     return shipping_name, billing_name, customer, payment_method, delivery_method
@@ -251,8 +258,13 @@ async def run_sync(id_pol: int = None, id_sectie: int = None, run_id: str = None
                 # Step 2c: Build SKU context from skipped orders
                 sku_context = {}
                 for order, missing_skus_list in skipped:
-                    customer = order.billing.company_name or \
-                        f"{order.billing.firstname} {order.billing.lastname}"
+                    if order.billing.is_company and order.billing.company_name:
+                        customer = order.billing.company_name
+                    else:
+                        ship_name = ""
+                        if order.shipping:
+                            ship_name = f"{order.shipping.firstname} {order.shipping.lastname}".strip()
+                        customer = ship_name or f"{order.billing.firstname} {order.billing.lastname}"
                     for sku in missing_skus_list:
                         if sku not in sku_context:
                             sku_context[sku] = {"orders": [], "customers": []}