refactor: rename the theme brand and every identifier from AKSRT to Jio

Full-project rename. `git grep -i aksrt` is now empty apart from the
DBMigrator 3.3.0 changelog note that documents the rename itself.

Code identifiers
- PHP namespace AKSRT\ -> Jio\ (composer PSR-4 + 378 declarations)
- global constants AKSRT_* -> JIO_* (VERSION/DIR/URI, PAY_TYPE_*, CAPTCHA_*)
- procedural functions, hooks, options, meta keys, table names,
  cookies, query vars, ajax actions and nonces: aksrt_ -> jio_
- text domain aksrt -> jio; Theme Name -> Jio
- JS globals: aksrtData/aksrtAdminData/... -> jioData/jioAdminData/...,
  window.AKSRTCaptcha & friends -> window.JioCaptcha, Aksrt* -> Jio*
- Vue components Aks*.vue -> Jio*.vue (15 files renamed + imports)
- CSS classes/data-attrs/custom properties: aksrt- -> jio-
- REST namespace aksrt/v1 -> jio/v1 (incl. payment gateway callbacks)

Storage layer
- DB tables {prefix}aksrt_* -> {prefix}jio_*; SCHEMA_VERSION 3.2.0 -> 3.3.0
  so dbDelta creates the new names on install
- widget id_base aksrt_widget_* -> jio_widget_*
- uninstall.php drop list rebuilt from the actual migrator tables
  (dropped 3 stale entries, added the 17 missing ones)

Removed
- hardcoded https://api.aksrt.com/version.json default update endpoint;
  get_endpoint() now reads the 「更新端点」 setting and do_check() no-ops
  when it is empty

Files renamed: inc/helpers/aksrt-*.php -> jio-*.php (54),
assets/admin/src/components/form/Aks*.vue -> Jio*.vue (15).
Build artifacts regenerated: assets/css/build, assets/js/runtime,
assets/admin/build.

Verified: audit-psr4-paths errors=0, audit-admin-contracts errors=0
(warnings=56, unchanged baseline), 813/813 widget-system tests,
44/44 phpunit, php -l clean across all PHP.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

assets/js/page-template.js

@@ -1,10 +1,10 @@
 /**
- * AKSRT Page Template
+ * Jio Page Template
  *
  * Handles template-scoped content interactions: expandable article bodies
  * and one-shot query cleanup banners.
  *
- * @package AKSRT
+ * @package Jio
  */
 
 (function () {
@@ -13,8 +13,8 @@
   function initContentExpand() {
     // legacy-style: inject .read-more inside .limit-height and expand on click.
     document.querySelectorAll('.wp-posts-content.limit-height, .limit-height[data-nav]').forEach(function (content) {
-      if (content.dataset.aksrtExpandBound === '1') return;
-      content.dataset.aksrtExpandBound = '1';
+      if (content.dataset.jioExpandBound === '1') return;
+      content.dataset.jioExpandBound = '1';
 
       var customMax = parseInt(content.getAttribute('data-maxheight') || content.dataset.maxheight || '0', 10);
       // data-maxheight may be maxheight-80 (legacy) or absolute maxheight; prefer style max-height.
@@ -74,8 +74,8 @@
   }
 
   function initFlashQueryCleanup() {
-    document.querySelectorAll('[data-aksrt-flash-query]').forEach(function (node) {
-      var queryKey = node.getAttribute('data-aksrt-flash-query');
+    document.querySelectorAll('[data-jio-flash-query]').forEach(function (node) {
+      var queryKey = node.getAttribute('data-jio-flash-query');
       if (!queryKey || !window.history || typeof window.history.replaceState !== 'function') return;
 
       var url = new URL(window.location.href);
@@ -91,5 +91,5 @@
     initFlashQueryCleanup();
   }
 
-  jQuery(document).off('auto_fun.aksrt-page-template').on('auto_fun.aksrt-page-template', function () { init(document); });
+  jQuery(document).off('auto_fun.jio-page-template').on('auto_fun.jio-page-template', function () { init(document); });
 })();