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/follow.js

@@ -1,20 +1,20 @@
 /**
- * AKSRT Follow — 前台关注交互
+ * Jio Follow — 前台关注交互
  *
- * @package AKSRT
+ * @package Jio
  */
 (function () {
   'use strict';
 
   var API_ROOT = (function () {
-    var data = window.aksrtData || {};
-    var raw = data.apiUrl || data.restUrl || data.rest_url || '/index.php?rest_route=/aksrt/v1';
+    var data = window.jioData || {};
+    var raw = data.apiUrl || data.restUrl || data.rest_url || '/index.php?rest_route=/jio/v1';
     return String(raw).replace(/\/$/, '');
   })();
-  var NONCE = (window.aksrtData && window.aksrtData.restNonce) || '';
+  var NONCE = (window.jioData && window.jioData.restNonce) || '';
 
   function buttonsFor(userId) {
-    return Array.prototype.slice.call(document.querySelectorAll('[data-aksrt-follow="' + userId + '"]'));
+    return Array.prototype.slice.call(document.querySelectorAll('[data-jio-follow="' + userId + '"]'));
   }
 
   function setLoading(buttons, loading) {
@@ -26,7 +26,7 @@
 
   function updateButton(button, isFollowing) {
     var icon = button.querySelector('i');
-    var label = button.querySelector('[data-aksrt-follow-label]');
+    var label = button.querySelector('[data-jio-follow-label]');
     if (!label) return;
 
     button.classList.toggle('is-following', isFollowing);
@@ -38,7 +38,7 @@
   }
 
   function updateFollowerCount(count) {
-    var countEl = document.querySelector('.aksrt-user-home__stat-value[data-followers]');
+    var countEl = document.querySelector('.jio-user-home__stat-value[data-followers]');
     if (countEl && count !== undefined) {
       countEl.textContent = count;
     }
@@ -46,11 +46,11 @@
 
   // 全局 document 委托只绑定一次（模块顶层执行）。
   document.addEventListener('click', function (event) {
-    var button = event.target.closest('[data-aksrt-follow]');
+    var button = event.target.closest('[data-jio-follow]');
     if (!button) return;
     event.preventDefault();
 
-    var targetUserId = parseInt(button.getAttribute('data-aksrt-follow'), 10);
+    var targetUserId = parseInt(button.getAttribute('data-jio-follow'), 10);
     if (!targetUserId || button.disabled) return;
 
     var matchingButtons = buttonsFor(targetUserId);