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-edit.js

@@ -1,18 +1,18 @@
 /**
- * AKSRT Page Edit — 前台编辑增强
+ * Jio Page Edit — 前台编辑增强
  *
  * 提供前台编辑页面的增强功能：
  * - 自动保存草稿
  * - 标签建议
  * - 快捷键支持
  *
- * @package AKSRT
+ * @package Jio
  */
 
 (function () {
   'use strict';
 
-  var DRAFT_KEY_PREFIX = 'aksrt_draft_';
+  var DRAFT_KEY_PREFIX = 'jio_draft_';
 
   /**
    * 初始化页面编辑增强
@@ -21,7 +21,7 @@
    */
   function PageEdit(options) {
     this.options = Object.assign({
-      formSelector: 'form[data-aksrt-edit]',
+      formSelector: 'form[data-jio-edit]',
       titleSelector: 'input[name="title"], input[name="topic_title"]',
       contentSelector: 'textarea[name="content"], textarea[name="topic_content"]',
       tagsSelector: 'input[name="tags"], input[name="topic_tags"]',
@@ -102,20 +102,20 @@
       this.lastSavedContent = content;
 
       // 显示保存提示
-      var toast = document.getElementById('aksrt-draft-toast');
+      var toast = document.getElementById('jio-draft-toast');
       if (!toast) {
         toast = document.createElement('div');
-        toast.id = 'aksrt-draft-toast';
-        toast.className = 'aksrt-page-edit__toast';
+        toast.id = 'jio-draft-toast';
+        toast.className = 'jio-page-edit__toast';
         document.body.appendChild(toast);
       }
       toast.textContent = '草稿已自动保存';
-      toast.classList.add('aksrt-page-edit__toast--visible');
+      toast.classList.add('jio-page-edit__toast--visible');
       setTimeout(function () {
-        toast.classList.remove('aksrt-page-edit__toast--visible');
+        toast.classList.remove('jio-page-edit__toast--visible');
       }, 2000);
     } catch (e) {
-      console.error('[AKSRT PageEdit] 保存草稿失败:', e);
+      console.error('[Jio PageEdit] 保存草稿失败:', e);
     }
   };
 
@@ -144,7 +144,7 @@
         this.lastSavedContent = saved;
       }
     } catch (e) {
-      console.error('[AKSRT PageEdit] 恢复草稿失败:', e);
+      console.error('[Jio PageEdit] 恢复草稿失败:', e);
     }
   };
 
@@ -190,13 +190,13 @@
 
   // 自动初始化
   function autoInit() {
-    var form = document.querySelector('form[data-aksrt-edit]');
+    var form = document.querySelector('form[data-jio-edit]');
     if (form) {
       new PageEdit();
     }
   }
 
-  jQuery(document).off('auto_fun.aksrt-page-edit').on('auto_fun.aksrt-page-edit', autoInit);
+  jQuery(document).off('auto_fun.jio-page-edit').on('auto_fun.jio-page-edit', autoInit);
 
-  window.AksrtPageEdit = PageEdit;
+  window.JioPageEdit = PageEdit;
 })();