feat(vip): Batch 3 dedicated user-center VIP tab

Register 我的会员 panel, zibll-style status/equity cards, sidebar deep-link,
and slim credits-tab entry so VIP is no longer nested only under assets.

inc/helpers/user-center-renderers/profile-vip.php

@@ -0,0 +1,13 @@
+<?php
+/**
+ * User center VIP panel entry (maps tab=vip).
+ *
+ * @package AKSRT
+ */
+
+defined('ABSPATH') || exit;
+
+$context = is_array($args['context'] ?? null) ? $args['context'] : [];
+extract($context, EXTR_SKIP); // phpcs:ignore WordPress.PHP.DontExtract.extract_extract
+
+require __DIR__ . '/vip-tab.php';