Eliminate Company\CompaniesController, introduce owner role

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.

tests/Feature/Admin/CompanyTest.php

@@ -1,6 +1,6 @@
 <?php
 
-use App\Http\Controllers\Company\CompaniesController;
+use App\Http\Controllers\Admin\CompaniesController;
 use App\Http\Requests\CompaniesRequest;
 use App\Models\Company;
 use App\Models\User;