[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_get_routes.py

@@ -0,0 +1,85 @@
+# 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 TestPortalGetRoutes(HttpCase):
+    """Comprueba que las rutas GET principales devuelvan 200 para un usuario portal."""
+
+    def setUp(self):
+        super().setUp()
+
+        # Create a consumer group and a member partner
+        self.group = self.env["res.partner"].create(
+            {
+                "name": "Portal Routes Group",
+                "is_company": True,
+                "email": "routes-group@test.com",
+            }
+        )
+
+        self.member_partner = self.env["res.partner"].create(
+            {"name": "Routes Member", "email": "routes-member@test.com"}
+        )
+        self.group.member_ids = [(4, self.member_partner.id)]
+
+        # Create a portal user (password = login for HttpCase.authenticate convenience)
+        login = "portal.routes@test.com"
+        self.portal_user = self.env["res.users"].create(
+            {
+                "name": "Portal Routes User",
+                "login": login,
+                "password": login,
+                "partner_id": self.member_partner.id,
+                "groups_id": [(4, self.env.ref("base.group_portal").id)],
+            }
+        )
+
+        # Create and open a minimal group.order
+        start_date = datetime.now().date()
+        self.group_order = self.env["group.order"].create(
+            {
+                "name": "Routes Test 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_get_routes_return_200(self):
+        """Verifica que las rutas principales GET devuelvan 200 para usuario portal."""
+        # Authenticate as portal user
+        self.authenticate(self.portal_user.login, self.portal_user.login)
+
+        routes = [
+            "/eskaera",
+            f"/eskaera/{self.group_order.id}",
+            f"/eskaera/{self.group_order.id}/checkout",
+            f"/eskaera/{self.group_order.id}/load-page?page=1",
+            "/eskaera/labels",
+        ]
+
+        for route in routes:
+            response = self.url_open(route, allow_redirects=True)
+            status = getattr(response, "status_code", None) or getattr(
+                response, "status", None
+            )
+            # HttpCase returns werkzeug response-like objects; ensure we check 200
+            try:
+                code = int(status)
+            except Exception:
+                # Fallback: check content exists
+                code = 200 if response.get_data(as_text=True) else 500
+
+            self.assertEqual(code, 200, msg=f"Ruta {route} devolvió {code}")