[ADD] website_sale_aplicoop: Add sequence field to group.order for custom ordering

- Add sequence field to group.order model with default value 10
- Update _order to sort by sequence first, then start_date desc
- Add sequence field to tree view with handle widget for drag-and-drop reordering
- Add sequence field to form view for manual editing
- Orders in website list will now be ordered by sequence field

website_sale_aplicoop/models/group_order.py

@@ -16,7 +16,7 @@ class GroupOrder(models.Model):
     _name = "group.order"
     _description = "Consumer Group Order"
     _inherit = ["mail.thread", "mail.activity.mixin"]
-    _order = "start_date desc"
+    _order = "sequence, start_date desc"
 
     def _get_order_type_selection(self):
         """Return order type selection options with translations."""
@@ -65,6 +65,12 @@ class GroupOrder(models.Model):
         help="Company that owns this consumer group order",
     )
 
+    # === Secuencia ===
+    sequence = fields.Integer(
+        default=10,
+        help="Sequence for ordering group orders in the website list",
+    )
+
     # === Campos básicos ===
     name = fields.Char(
         required=True,