[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/models/group_order.py

@@ -483,16 +483,64 @@ class GroupOrder(models.Model):
                     len(products),
                 )
 
-        # Sort products: in-stock first, then out-of-stock, maintaining sequence+name within each group
-        # is_out_of_stock is Boolean: False (in stock) comes first, True (out of stock) comes last
+        return self._apply_stock_filter_and_sort(products, order)
+
+    def _apply_stock_filter_and_sort(self, products, order):
+        """Filter out storable products with no forecasted net stock, then sort.
+
+        Forecasted net qty = virtual_available − draft/sent sale.order demand.
+        Products with allow_out_of_stock_order=True or non-storable are never excluded.
+        """
+        draft_demand = self._compute_draft_sale_demand(products)
+        before = len(products)
+        products = products.filtered(
+            lambda p: getattr(p, "allow_out_of_stock_order", True)
+            or not getattr(p.product_tmpl_id, "is_storable", False)
+            or (p.virtual_available - draft_demand.get(p.id, 0.0)) > 0
+        )
+        if len(products) < before:
+            _logger.info(
+                "Group order %d: Excluded %d products with no forecasted net stock (total: %d)",
+                order.id,
+                before - len(products),
+                len(products),
+            )
         return products.sorted(
             lambda p: (
-                p.is_out_of_stock,  # Boolean: False < True, so in-stock products first
+                p.is_out_of_stock,
                 p.product_tmpl_id.website_sequence,
                 (p.name or "").lower(),
             )
         )
 
+    @api.model
+    def _compute_draft_sale_demand(self, products):
+        """Return pending draft/sent sale.order demand per product.id (qty in product UoM).
+
+        Mirrors the logic in sale_stock/report/stock_forecasted.py used by the
+        "Informe pronosticado" report, which includes quotations not yet confirmed.
+        """
+        if not products:
+            return {}
+        sol = (
+            self.env["sale.order.line"]
+            .sudo()
+            .search(
+                [
+                    ("state", "in", ["draft", "sent"]),
+                    ("product_id", "in", products.ids),
+                ]
+            )
+        )
+        demand = {p.id: 0.0 for p in products}
+        for line in sol:
+            pid = line.product_id.id
+            if pid in demand:
+                demand[pid] += line.product_uom._compute_quantity(
+                    line.product_uom_qty, line.product_id.uom_id
+                )
+        return demand
+
     def _get_products_paginated(self, order_id, page=1, per_page=20):
         """Get paginated products for a group order.