[TEST] website_sale_aplicoop: add tests for home_delivery computed field

- New test_home_delivery.py: verifies group.order.home_delivery derives
  from delivery_product_id (compute), and that sale.order.home_delivery
  is set correctly through _get_effective_delivery_context
- Fix test_save_order_endpoints: replace home_delivery=True (now ignored
  on computed field) with delivery_product_id to enable delivery
- Fix test_phase3_confirm_eskaera: same fix for integration test setUp

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

website_sale_aplicoop/tests/test_phase3_confirm_eskaera.py

@@ -694,6 +694,16 @@ class TestConfirmEskaera_Integration(TransactionCase):
             }
         )
 
+        # Delivery service product — home_delivery on group.order is computed
+        # from delivery_product_id, so we must set the product to enable delivery.
+        self.delivery_product = self.env["product.product"].create(
+            {
+                "name": "Integration Delivery Svc",
+                "type": "service",
+                "list_price": 0.0,
+            }
+        )
+
         # Create test group order
         self.group_order = self.env["group.order"].create(
             {
@@ -704,7 +714,7 @@ class TestConfirmEskaera_Integration(TransactionCase):
                 "end_date": date.today() + timedelta(days=7),
                 "cutoff_day": "3",
                 "pickup_day": "5",
-                "home_delivery": True,
+                "delivery_product_id": self.delivery_product.id,
             }
         )