Add super-admin Administration section and restructure global vs company settings

- Add Administration sidebar section (super-admin only) with Companies, Users, and Global Settings pages
- Add super-admin middleware, controllers, and API routes under /api/v1/super-admin/
- Allow super-admins to manage all companies and users across tenants
- Add user impersonation with short-lived tokens, audit logging, and UI banner
- Move system-level settings (Mail, PDF, Backup, Update, File Disk) from per-company to Administration > Global Settings
- Convert save_pdf_to_disk from CompanySetting to global Setting
- Add per-company mail configuration overrides (optional, falls back to global)
- Add CompanyMailConfigService to apply company mail config before sending emails

app/Providers/AppServiceProvider.php

@@ -110,9 +110,11 @@ class AppServiceProvider extends ServiceProvider
             ->data('icon', $data['icon'])
             ->data('name', $data['name'])
             ->data('owner_only', $data['owner_only'])
+            ->data('super_admin_only', $data['super_admin_only'] ?? false)
             ->data('ability', $data['ability'])
             ->data('model', $data['model'])
-            ->data('group', $data['group']);
+            ->data('group', $data['group'])
+            ->data('group_label', $data['group_label'] ?? '');
     }
 
     public function bootAuth()