feat: Prepare Zemailnator for Dokploy deployment

- Add highly optimized Dockerfile with Nginx and PHP-FPM 8.4
- Add docker-compose.yml configured with Redis and MariaDB 10.11
- Implement entrypoint.sh and supervisord.conf for background workers
- Refactor legacy IMAP scripts into scheduled Artisan Commands
- Secure app by removing old routes with hardcoded basic auth credentials
- Configure email attachments to use Laravel Storage instead of insecure public/tmp

app/Filament/Resources/TrialExtensions/TrialExtensionResource.php

@@ -7,7 +7,6 @@ use App\Filament\Resources\TrialExtensions\Pages\EditTrialExtension;
 use App\Filament\Resources\TrialExtensions\Pages\ListTrialExtensions;
 use App\Filament\Resources\TrialExtensions\Schemas\TrialExtensionForm;
 use App\Filament\Resources\TrialExtensions\Tables\TrialExtensionsTable;
-use App\Models\Subscription;
 use App\Models\TrialExtension;
 use BackedEnum;
 use Filament\Resources\Resource;