[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/models/group_order.py

@@ -243,13 +243,11 @@ class GroupOrder(models.Model):
                     raise ValidationError(
                         self.env._(
                             "Group %(group)s belongs to company %(group_company)s, "
-                            "not to %(record_company)s."
+                            "not to %(record_company)s.",
+                            group=group.name,
+                            group_company=group.company_id.name,
+                            record_company=record.company_id.name,
                         )
-                        % {
-                            "group": group.name,
-                            "group_company": group.company_id.name,
-                            "record_company": record.company_id.name,
-                        }
                     )
 
     @api.constrains("start_date", "end_date")
@@ -545,9 +543,10 @@ class GroupOrder(models.Model):
                         self.env._(
                             "For weekly orders, pickup day (%(pickup)s) must be after or equal to "
                             "cutoff day (%(cutoff)s) in the same week. Current configuration would "
-                            "put pickup before cutoff, which is illogical."
+                            "put pickup before cutoff, which is illogical.",
+                            pickup=pickup_name,
+                            cutoff=cutoff_name,
                         )
-                        % {"pickup": pickup_name, "cutoff": cutoff_name}
                     )
 
     # === Onchange Methods ===

website_sale_aplicoop/models/product_extension.py

@@ -1,11 +1,12 @@
 # Copyright 2025 Criptomart
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl)
 
-from odoo import _
 from odoo import api
 from odoo import fields
 from odoo import models
 
+# Note: translation function _ is not used in this module (removed to satisfy flake8)
+
 
 class ProductProduct(models.Model):
     _inherit = "product.product"

website_sale_aplicoop/models/res_partner_extension.py

@@ -1,10 +1,11 @@
 # Copyright 2025-Today Criptomart
 # License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl)
 
-from odoo import _
 from odoo import fields
 from odoo import models
 
+# Note: translation function _ is not used in this module (removed to satisfy flake8)
+
 
 class ResPartner(models.Model):
     _inherit = "res.partner"