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/Console/Commands/CleanAttachmentsCommand.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Console\Commands;
+
+use App\Models\Email;
+use Illuminate\Console\Command;
+
+class CleanAttachmentsCommand extends Command
+{
+    /**
+     * The name and signature of the console command.
+     *
+     * @var string
+     */
+    protected $signature = 'attachments:clean';
+
+    /**
+     * The console command description.
+     *
+     * @var string
+     */
+    protected $description = 'Clean old email attachments from disk';
+
+    /**
+     * Execute the console command.
+     */
+    public function handle()
+    {
+        $this->info('Starting to clean attachments...');
+        Email::deleteBulkAttachments();
+        $this->info('Finished cleaning attachments.');
+    }
+}