refactor(classes): split oversize modules + bootstrap hygiene

- Trait-split content-pay, vip-service, balance-service, order-repository
- Procedural split of user module into user-parts/*
- Split scripts enqueue_public into part-1b/1c; settings bulk trait
- Bootstrap: explicit notifications, widgets glob-only, home-modules init
- ADR: freeze domain placement for pay/revenue/notify boundaries

functions.php

@@ -199,6 +199,10 @@ if (class_exists('AKSRT_Download_State')) {
 if (class_exists('AKSRT_Docs_Presenter')) {
     AKSRT_Docs_Presenter::get_instance();
 }
+// Homepage module preview REST + query var (render still via helpers / static methods)
+if (class_exists('AKSRT_Home_Modules')) {
+    AKSRT_Home_Modules::get_instance()->init();
+}
 if (class_exists('AKSRT_Content_Visibility')) {
     AKSRT_Content_Visibility::get_instance()->init();
 }