- Settings -> System -> Roles (summercms.cabana.roles, backend.manage_roles,
order 110): name, code slugged from the name, description, checkbox
permission editor with the editor's ceiling
- system roles (is_system or code-declared grants) keep their code and
cannot be deleted; a role any admin holds (deleted ones included) cannot
be deleted, the refusal names the role and the count
- role codes unique among roles
- pact.HasAdminActionExtensions / AdminActionExtension: plugins add record
actions to any admin controller by ID, merged at boot before permission
validation (unknown target, no preview, duplicate name stop the boot)
- internal summercms.cabana pseudo-plugin, appended only when some plugin
registers admin controllers: Administrators list and preview, settings
link under System, backend.manage_users and backend.manage_roles with no
role grants
- backend::lang user, user.role and permissions copy (en, pl)
- smoke tests: compile-time seam and settings, Postgres list/preview/action
