[REF] Code quality improvements and structure fixes

- Add mypy.ini configuration to exclude migration scripts
- Rename migration files to proper snake_case (post-migration.py → post_migration.py)
- Add __init__.py to migration directories for proper Python package structure
- Add new portal access tests for website_sale_aplicoop
- Code formatting improvements (black, isort)
- Update copilot instructions and project configuration

Related to previous code quality refactoring work.

website_sale_aplicoop/tests/test_portal_access.py

@@ -0,0 +1,83 @@
+# Copyright 2026
+# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl)
+
+from datetime import datetime
+from datetime import timedelta
+
+from odoo.tests import tagged
+from odoo.tests.common import HttpCase
+
+
+@tagged("post_install", "-at_install")
+class TestPortalAccess(HttpCase):
+    """Verifica que un usuario portal pueda acceder a la página de un pedido (eskaera)."""
+
+    def setUp(self):
+        super().setUp()
+        # Create a consumer group and a member partner
+        self.group = self.env["res.partner"].create(
+            {
+                "name": "Portal Test Group",
+                "is_company": True,
+                "email": "portal-group@test.com",
+            }
+        )
+
+        self.member_partner = self.env["res.partner"].create(
+            {
+                "name": "Portal Member",
+                "email": "portal-member@test.com",
+            }
+        )
+
+        # Add member to the group
+        self.group.member_ids = [(4, self.member_partner.id)]
+
+        # Create a portal user (password = login for HttpCase.authenticate convenience)
+        login = "portal.user@test.com"
+        self.portal_user = self.env["res.users"].create(
+            {
+                "name": "Portal User",
+                "login": login,
+                "password": login,
+                "partner_id": self.member_partner.id,
+                # Add portal group
+                "groups_id": [(4, self.env.ref("base.group_portal").id)],
+            }
+        )
+
+        # Create and open a group.order belonging to the same company
+        start_date = datetime.now().date()
+        self.group_order = self.env["group.order"].create(
+            {
+                "name": "Portal Access Order",
+                "group_ids": [(6, 0, [self.group.id])],
+                "type": "regular",
+                "start_date": start_date,
+                "end_date": start_date + timedelta(days=7),
+                "period": "weekly",
+                "pickup_day": "3",
+                "cutoff_day": "0",
+            }
+        )
+        self.group_order.action_open()
+
+    def test_portal_user_can_view_eskaera_page(self):
+        """El endpoint /eskaera/<id> debe ser accesible por un usuario portal que pertenezca a la compañía."""
+        # Authenticate as portal user
+        self.authenticate(self.portal_user.login, self.portal_user.login)
+
+        # Request the eskaera page
+        response = self.url_open(
+            f"/eskaera/{self.group_order.id}", allow_redirects=True
+        )
+
+        # Should return 200 OK and not redirect to login
+        self.assertEqual(response.status_code, 200)
+        # Simple sanity: page should contain the group order name
+        content = (
+            response.get_data(as_text=True)
+            if hasattr(response, "get_data")
+            else getattr(response, "text", "")
+        )
+        self.assertIn(self.group_order.name, content)