[FIX] website_sale_aplicoop: auto-derive home_delivery from delivery_product_id

Make group.order.home_delivery a computed stored field that is True
whenever delivery_product_id is set, eliminating the manual checkbox
that could be forgotten. This fixes sale.order.home_delivery not being
set when the delivery product was configured but the boolean was left
unchecked.

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

website_sale_aplicoop/models/group_order.py

@@ -134,7 +134,8 @@ class GroupOrder(models.Model):
 
     # === Home delivery ===
     home_delivery = fields.Boolean(
-        default=False,
+        compute="_compute_home_delivery",
+        store=True,
         tracking=True,
         help="Whether this consumer group order includes home delivery service",
     )
@@ -255,6 +256,11 @@ class GroupOrder(models.Model):
             else:
                 record.display_image = False
 
+    @api.depends("delivery_product_id")
+    def _compute_home_delivery(self):
+        for record in self:
+            record.home_delivery = bool(record.delivery_product_id)
+
     available_products_count = fields.Integer(
         compute="_compute_available_products_count",
         store=False,