[ADD] stock_ux: auto-activate multi-warehouse group for branch warehouses

[mav-adhoc]

What

Make the standard Manage Multiple Warehouses group
(stock.group_stock_multi_warehouses) follow the warehouses of the whole
company tree: activate it when a company has branches (child
companies) that own warehouses — even with a single warehouse each — and turn
it off again when those warehouses, or their branches, are archived.

Why

Native stock.warehouse._check_multiwarehouse_group() counts active
warehouses grouped by company_id, and only activates the group when a
single company has more than one warehouse. A branch is a child
res.company with its own company_id, so a setup with one warehouse per
branch leaves the per-company count at 1 and the multi-warehouse UI is never
enabled. The behaviour is the same on 18.0; this generalizes the counting.

The other half is the way back. Archiving a company does not archive its
warehouses, and the native check only runs on warehouse create / archive /
unlink, so archiving a branch left the count untouched and the permission
on — with no way to turn it off from the interface: Settings refuses to
untick Storage Locations while multi-warehouse is implied
(res.config.settings.set_values), and multi-warehouse itself is not a
user-facing checkbox.

How

Override the method in stock_ux:

• _multiwarehouse_count_by_root_company() counts active warehouses of
  active companies, aggregated by company_id.root_id (the top of the
  company tree), so a parent company and its branches count together.
• _check_multiwarehouse_group() activates / deactivates on that count. For
  a company without branches root_id is the company itself, so nothing
  changes for non-branch setups.
• res.company.write() re-runs the check when a company is archived or
  restored — the events that change which warehouses are in play and that the
  native method never sees. (The hierarchy itself cannot change afterwards:
  res.company.write refuses parent_id.)

Test plan

stock_ux/tests/test_multiwarehouse_group.py:

• test_warehouses_are_counted_by_company_tree: parent + branch, one
  warehouse each, count 1 per company_id natively but 2 under the root.
• test_branch_warehouse_activates_multi_wh_group: starting with the group
  not implied, creating a branch with a warehouse activates it.
• test_archived_branch_deactivates_group: archiving the branch (its
  warehouse stays active) drops the count and removes the group.
• test_unarchived_branch_activates_group_again: and restoring it puts the
  group back.
• test_archived_branch_warehouse_deactivates_group: same going through the
  warehouse instead of the company.
• test_single_warehouse_per_company_deactivates_group: no regression for
  setups without branches.

0 failed, 0 error(s) of 8 tests locally with -u stock_ux --test-enable --test-tags /stock_ux. Each piece was checked in isolation: dropping the
res.company hook, or the active-company filter in the count, makes
test_archived_branch_deactivates_group and
test_unarchived_branch_activates_group_again fail.

Task: https://www.adhoc.inc/odoo/my-tasks/69369

[roboadhoc]

[Copilot]

Pull request overview

Este PR mejora la UX de inventario en stock_ux activando automáticamente el grupo estándar “Gestionar varios almacenes” cuando existen sucursales (compañías hijas) con almacenes, agregando el conteo por árbol de compañías (company_id.root_id) en lugar de por compañía individual.

Changes:

• Override de stock.warehouse._check_multiwarehouse_group() para calcular el máximo de almacenes activos por root company mediante un helper _multiwarehouse_max_count().
• Nuevos tests para cubrir el escenario “madre + sucursal, 1 almacén por compañía” y la activación del grupo.
• Actualización de README y bump de versión del módulo.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
stock_ux/models/stock_warehouse.py	Override de la lógica de activación del grupo multi-almacén agregando el conteo por root_id.
stock_ux/models/init.py	Export del nuevo archivo de modelo.
stock_ux/tests/test_multiwarehouse_group.py	Tests nuevos para el conteo agregado por árbol y la activación del grupo.
stock_ux/tests/init.py	Import del módulo de tests para su carga.
stock_ux/README.rst	Documenta la nueva funcionalidad de auto-activación.
stock_ux/manifest.py	Bump de versión del módulo.