feat(users): add inline promotion center

inc/modules/user-parts/urls.php

@@ -32,7 +32,7 @@ function aksrt_get_user_center_url(string $tab = ''): string {
             'assets' => 'credits',
             'vip'    => 'vip', // dedicated vip tab when registered; resolver falls back if missing
             'signin' => 'credits',
-            'invite' => 'settings',
+            'invite' => 'promotion',
         ];
         if (isset($aliases[$tab])) {
             $tab = $aliases[$tab];