review code pattern consistency

app/login/api/engine/register.php

@@ -60,7 +60,8 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
     $csrf = $_SERVER['HTTP_X_CSRF_TOKEN'] ?? '';
     if (empty($csrf) || $csrf !== ($_SESSION['csrf_token'] ?? '')) {
         http_response_code(403);
-        exit(json_encode(['message' => 'Invalid request.']));
+        $answer['message'] = 'Invalid request.';
+        exit(json_encode($answer));
     }
 }
 
@@ -177,7 +178,7 @@ try {
     // Uses $SMTP from config.php (system-level, not company SMTP) because the
     // user does not have a company yet at registration time.
     // If the mailer fails it exits internally with its own error JSON response.
-    require_once $include_url . 'assets/utils/module/mailer.php';
+    require_once '../../../assets/utils/module/mailer.php';
 
     $mailer = new mailer(['pdo1' => $pdo1]);
     $mailer->send_email([