implemeted step 13 by Gemini

- added configuracion .env
- added test script for DAI API client

public/ajax.php

@@ -4,6 +4,9 @@ declare(strict_types=1);
 
 require_once __DIR__ . '/../vendor/autoload.php';
 
+// Load configuration
+\App\Utils\Config::load(__DIR__ . '/../.env');
+
 // Set headers
 header('Content-Type: application/json; charset=utf-8');