[IMP] website_sale_aplicoop: filter and cap stock using forecasted net qty

Group orders are not confirmed until the cutoff date, so draft/sent
sale.order lines never generate stock.moves and are invisible to
virtual_available. This change makes the shop aware of that demand.

- group.order._compute_draft_sale_demand: queries sale.order.line in
  draft/sent state (mirroring sale_stock forecasted report logic) and
  returns pending demand per product.id in the product's own UoM.
- _get_products_for_group_order: delegates to new _apply_stock_filter_and_sort
  which excludes storable products whose forecasted net qty
  (virtual_available − draft demand) <= 0, unless allow_out_of_stock_order.
- _compute_stock_ribbons: reads draft_demand_by_product from ORM context
  so is_out_of_stock / is_low_stock / dynamic_ribbon_id reflect net qty.
- Controller: new _prepare_draft_stock_data helper calculates demand once
  per request, injects context, and builds product_max_qty dict. Applied
  in eskaera_shop, load_eskaera_page and load_products_ajax.
- Template: qty input gets max and data-max-qty from product_max_qty.
- JS: blocks add-to-cart if requested quantity exceeds data-max-qty.
- Fixes type check: type=='consu' → is_storable=True (Odoo 18 semantics).
- 21 new tests in test_forecasted_stock.py covering demand calculation,
  ribbon logic with context, and group order filtering.

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

website_sale_aplicoop/controllers/website_sale.py

@@ -572,6 +572,25 @@ class AplicoopWebsiteSale(WebsiteSale):
         """Delegate preparation of product maps to products helper."""
         return _products._prepare_products_maps(self, products, pricelist)
 
+    def _prepare_draft_stock_data(self, products):
+        """Return (products_with_context, product_max_qty) for Eskaera stock rendering.
+
+        Computes draft/sent sale.order demand and injects it as context so that
+        is_out_of_stock / is_low_stock / dynamic_ribbon_id reflect forecasted net qty.
+        product_max_qty maps product.id → net qty for storable products where
+        allow_out_of_stock_order is False and net qty > 0 (used as input[max]).
+        """
+        draft_demand = request.env["group.order"]._compute_draft_sale_demand(products)
+        products_ctx = products.with_context(draft_demand_by_product=draft_demand)
+        product_max_qty = {}
+        for p in products_ctx:
+            allow_oos = getattr(p, "allow_out_of_stock_order", True)
+            if not allow_oos and getattr(p.product_tmpl_id, "is_storable", False):
+                net = p.virtual_available - draft_demand.get(p.id, 0.0)
+                if net > 0:
+                    product_max_qty[p.id] = net
+        return products_ctx, product_max_qty
+
     def _merge_or_replace_draft(
         self,
         group_order,
@@ -790,6 +809,9 @@ class AplicoopWebsiteSale(WebsiteSale):
             filtered_products_dict,
         ) = self._prepare_products_maps(products, pricelist)
 
+        # Inject draft sale demand context so ribbons/is_out_of_stock use forecasted net qty
+        products, product_max_qty = self._prepare_draft_stock_data(products)
+
         # Manage session for separate cart per order
         session_key = f"eskaera_{order_id}"
         cart = request.session.get(session_key, {})
@@ -838,6 +860,7 @@ class AplicoopWebsiteSale(WebsiteSale):
                 "has_next": has_next,
                 "total_products": total_products,
                 "module_version": self._get_installed_module_version(),
+                "product_max_qty": product_max_qty,
             },
         )
 
@@ -931,6 +954,9 @@ class AplicoopWebsiteSale(WebsiteSale):
                 product, product_price_info
             )
 
+        # Inject draft demand context for ribbons/stock flags
+        products_page, product_max_qty = self._prepare_draft_stock_data(products_page)
+
         labels = self.get_checkout_labels()
 
         return request.render(
@@ -945,6 +971,7 @@ class AplicoopWebsiteSale(WebsiteSale):
                 "labels": labels,
                 "has_next": has_next,
                 "next_page": page + 1,
+                "product_max_qty": product_max_qty,
             },
         )
 
@@ -1047,6 +1074,9 @@ class AplicoopWebsiteSale(WebsiteSale):
             for product in products_page
         }
 
+        # Inject draft demand context for ribbons/stock flags
+        products_page, product_max_qty = self._prepare_draft_stock_data(products_page)
+
         # Render HTML
         html = (
             request.env["ir.ui.view"]
@@ -1063,6 +1093,7 @@ class AplicoopWebsiteSale(WebsiteSale):
                     "labels": self.get_checkout_labels(),
                     "has_next": has_next,
                     "next_page": page + 1,
+                    "product_max_qty": product_max_qty,
                 },
             )
         )