[ADD] website_sale_aplicoop: serve Eskaera per website

A co-op can run the plain shop on one website and the group orders on another,
but routes are registered process-wide: every /eskaera page answered on every
website of the database, and Odoo had already copied the Eskaera menu to all of
them.

`website.eskaera_enabled` decides which websites serve it, on by default so
installing changes nothing. It reaches the settings screen through `website_id`,
so it follows the website selector there. Where it is off the routes raise
NotFound and the menu is hidden.

The menu is hidden rather than deleted, by extending `_compute_visible`. That
keeps the record and any manual rename or reordering, so switching the feature
back on restores it as it was.

Note that a JSON route reports the 404 inside the JSON-RPC payload and still
answers HTTP 200; that is the transport, not a hole in the guard, and a test
pins it so the next reader does not take it for one.

The three remaining settings (lazy loading, products per page, low stock
threshold) are still `config_parameter`, so they stay global to the database.
Two websites share their values.

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

website_sale_aplicoop/models/website.py

@@ -0,0 +1,40 @@
+# Copyright 2025-Today Criptomart
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl)
+
+from odoo import fields
+from odoo import models
+
+ESKAERA_URL_PREFIX = "/eskaera"
+
+
+class Website(models.Model):
+    _inherit = "website"
+
+    eskaera_enabled = fields.Boolean(
+        string="Eskaera Group Orders",
+        default=True,
+        help="Serve the Eskaera collaborative purchasing pages on this website. "
+        "Turn it off on a website that only runs the regular shop: its "
+        "/eskaera pages answer 404 and its Eskaera menu is hidden.",
+    )
+
+
+class WebsiteMenu(models.Model):
+    _inherit = "website.menu"
+
+    def _compute_visible(self):
+        """Hide the Eskaera menu on websites that do not serve it.
+
+        Hiding rather than deleting the menu keeps the entry (and any manual
+        rename or reordering) around, so switching the feature back on
+        restores it as it was.
+        """
+        res = super()._compute_visible()
+        for menu in self:
+            if not menu.is_visible or not menu.website_id:
+                continue
+            if menu.website_id.eskaera_enabled:
+                continue
+            if (menu.url or "").startswith(ESKAERA_URL_PREFIX):
+                menu.is_visible = False
+        return res