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/Helpers/ArrayHelper.php

@@ -14,7 +14,7 @@ class ArrayHelper
         $keys = explode('.', $key);
 
         foreach ($keys as $segment) {
-            if (!isset($array[$segment])) {
+            if (! isset($array[$segment])) {
                 return null;
             }
             $array = $array[$segment];
@@ -32,7 +32,7 @@ class ArrayHelper
             );
         } catch (\JsonException $e) {
             // Optional: Log the error
-            Log::error("JSON encode failed: " . $e->getMessage());
+            Log::error('JSON encode failed: '.$e->getMessage());
 
             // Fallback: return empty object instead of crashing
             return '{}';