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

routes/api.php

@@ -3,4 +3,4 @@
 use Illuminate\Http\Request;
 use Illuminate\Support\Facades\Route;
 
-Route::get('/user', fn(Request $request) => $request->user())->middleware('auth:sanctum');
+Route::get('/user', fn (Request $request) => $request->user())->middleware('auth:sanctum');