feat(website_sale_aplicoop): sistema de ribbons basado en stock

- Añadidos ribbons 'Sin Stock' (rojo) y 'Pocas Existencias' (amarillo)
- Nuevo campo configurable: umbral de stock bajo (default: 5.0)
- Campos computed en product.product:
  * is_out_of_stock: True cuando qty_available <= 0
  * is_low_stock: True cuando 0 < qty_available <= threshold
  * dynamic_ribbon_id: ribbon automático según nivel de stock
- Ordenamiento mejorado: productos con stock primero, sin stock al final
- Template actualizado:
  * Muestra ribbon de stock en tarjeta de producto
  * Deshabilita botón add-to-cart cuando producto sin stock
  * Cambia icono a 'fa-ban' en productos sin stock
- Vista de configuración: campo 'Low Stock Threshold' en Settings > Shop Performance
- Solo aplica a productos type='consu' (almacenables)
- Tests: 112 pasados, 0 fallos

website_sale_aplicoop/models/product_extension.py

@@ -21,6 +21,71 @@ class ProductProduct(models.Model):
         help="Group orders where this product is available",
     )
 
+    is_out_of_stock = fields.Boolean(
+        string="Is Out of Stock",
+        compute="_compute_stock_ribbons",
+        store=False,
+        help="True if qty_available <= 0",
+    )
+
+    is_low_stock = fields.Boolean(
+        string="Is Low Stock",
+        compute="_compute_stock_ribbons",
+        store=False,
+        help="True if 0 < qty_available <= threshold",
+    )
+
+    dynamic_ribbon_id = fields.Many2one(
+        "product.ribbon",
+        string="Dynamic Stock Ribbon",
+        compute="_compute_stock_ribbons",
+        store=False,
+        help="Auto-assigned ribbon based on stock levels",
+    )
+
+    @api.depends("qty_available", "type")
+    def _compute_stock_ribbons(self):
+        """Compute stock-based ribbons dynamically."""
+        # Obtener ribbons (usar sudo para evitar permisos)
+        out_of_stock_ribbon = self.env.ref(
+            "website_sale_aplicoop.out_of_stock_ribbon", raise_if_not_found=False
+        )
+        low_stock_ribbon = self.env.ref(
+            "website_sale_aplicoop.low_stock_ribbon", raise_if_not_found=False
+        )
+
+        # Obtener threshold de configuración
+        threshold = float(
+            self.env["ir.config_parameter"]
+            .sudo()
+            .get_param("website_sale_aplicoop.low_stock_threshold", default="5.0")
+        )
+
+        for product in self:
+            # Solo para productos almacenables (type='consu' o 'product' en algunos casos)
+            # En Odoo 18: 'consu' = Goods (almacenable), 'service' = Service, 'combo' = Combo
+            if product.type != "consu":
+                product.is_out_of_stock = False
+                product.is_low_stock = False
+                product.dynamic_ribbon_id = False
+                continue
+
+            # Lógica de stock
+            qty = product.qty_available
+
+            if qty <= 0:
+                product.is_out_of_stock = True
+                product.is_low_stock = False
+                product.dynamic_ribbon_id = out_of_stock_ribbon
+            elif qty <= threshold:
+                product.is_out_of_stock = False
+                product.is_low_stock = True
+                product.dynamic_ribbon_id = low_stock_ribbon
+            else:
+                product.is_out_of_stock = False
+                product.is_low_stock = False
+                product.dynamic_ribbon_id = False  # No ribbon
+
     @api.model
     def _get_products_for_group_order(self, order_id):
         """Backward-compatible delegation to `group.order` discovery.