[REF] website_sale_aplicoop: price through website_sale instead of privately

Eskaera carried its own pricing path: a `website_sale_aplicoop.pricelist_id`
setting resolved inside the Eskaera controllers, plus a local reimplementation
of the tax and discount maths. The pricelist part meant /shop and Eskaera could
quote different prices on the same website, and the maths part had drifted from
the original it was copied from.

Pricing is now the standard one. The setting is gone (a migration drops the
parameter, which would otherwise linger looking like live configuration) and
`_resolve_pricelist` is `request.website.pricelist_id`. Scoping a pricelist to
a website is already core's job through `product.pricelist.website_id`, so
running the plain shop on one website and the co-op on another needs no code
here.

Taxes are applied by `product.template._apply_taxes_to_price`, which fixes a
real defect: it calls `_get_tax_included_unit_price_from_price` first, and this
module did not. With a fiscal position remapping a tax-included tax, a product
at 121 (100 + 21%) was displayed at 121 instead of 110, because the price was
handed to the mapped tax as if it were already that tax's gross amount. The
helper is a no-op without a remapping, so ordinary pricing is untouched. It
also means the website's `show_line_subtotals_tax_selection` is respected
rather than overridden with a hardcoded tax-included display.

Listing a page now costs one `_compute_price_rule` call instead of one per
product, which matters on the lazy-loading path.

Two smaller things found on the way. `_get_product_price_rule` was being passed
`target_currency=`, which is not one of its arguments: it fell into **kwargs
and was ignored, so the conversion never happened. And `_compute_price_info`
resolved `product.product_variant_ids[0]`, but it receives variants, so a
multi-variant template was priced from its first variant rather than the one
asked for.

The delivery display price loses its hardcoded 5.74 fallback and reuses the
same helpers as everything else.

Kept local, because none of it is pricing: the /Kg and /L suffixes, the 0.1
quantity step for bulk goods, the base unit price and the supplier name.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

website_sale_aplicoop/tests/test_phase3_confirm_eskaera.py

@@ -58,8 +58,14 @@ def _build_request_mock(env, payload=None, website=None):
             call pricing helpers).
     """
     if website is None:
+        # `pricelist_id` is what the pricing helpers read now that Eskaera
+        # prices with the standard website pricelist. Ordered by id on
+        # purpose: the multilang cases build an env whose language is not
+        # installed, and the default order is by the translated `name`.
         website = SimpleNamespace(
-            _get_current_pricelist=lambda: False,
+            pricelist_id=env["product.pricelist"]
+            .sudo()
+            .search([], limit=1, order="id"),
             show_line_subtotals_tax_selection="tax_excluded",
             fiscal_position_id=False,
             company_id=False,