Redistribute methods:
- show() -> BootstrapController::currentCompany()
- store(), destroy(), userCompanies() -> Admin\CompaniesController
- transferOwnership() -> CompanySettingsController
Security fix: introduce 'owner' role for company-level admin, distinct
from 'super admin' which is now global platform admin only.
- CompanyService::setupRoles() creates 'owner' role per company
- Company creation assigns scoped 'owner' role instead of global 'super admin'
- Seeders updated to assign 'owner'
Migration renames all existing company-scoped 'super admin' roles to
'owner' and ensures every company owner has the role assigned.
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