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/css/admin/admin-panel.css

@@ -1,45 +1,45 @@
-body.toplevel_page_aksrt-settings {
+body.toplevel_page_jio-settings {
   background: #f5f7fb;
 }
 
-body.toplevel_page_aksrt-settings #wpcontent {
+body.toplevel_page_jio-settings #wpcontent {
   padding-left: 0;
 }
 
-body.toplevel_page_aksrt-settings #wpbody-content {
+body.toplevel_page_jio-settings #wpbody-content {
   padding-bottom: 0;
 }
 
-body.toplevel_page_aksrt-settings #wpbody-content .wrap {
+body.toplevel_page_jio-settings #wpbody-content .wrap {
   margin: 0;
   padding: 0;
 }
 
-body.toplevel_page_aksrt-settings #wpbody-content .wrap > h1:first-child {
+body.toplevel_page_jio-settings #wpbody-content .wrap > h1:first-child {
   display: none !important;
 }
 
-body.toplevel_page_aksrt-settings #wpbody-content .notice,
-body.toplevel_page_aksrt-settings #wpbody-content .updated,
-body.toplevel_page_aksrt-settings #wpbody-content .error {
+body.toplevel_page_jio-settings #wpbody-content .notice,
+body.toplevel_page_jio-settings #wpbody-content .updated,
+body.toplevel_page_jio-settings #wpbody-content .error {
   position: relative;
   z-index: 3;
   margin: 18px 20px 0 0;
 }
 
-body.toplevel_page_aksrt-settings #collapse-menu {
+body.toplevel_page_jio-settings #collapse-menu {
   display: none !important;
 }
 
-#aksrt-admin-app {
+#jio-admin-app {
   position: relative;
   min-height: calc(100vh - 32px);
   isolation: isolate;
   background: transparent;
 }
 
-#aksrt-admin-app:empty::before {
-  content: "AKSRT 管理台加载中...";
+#jio-admin-app:empty::before {
+  content: "Jio 管理台加载中...";
   display: flex;
   align-items: center;
   justify-content: center;
@@ -63,21 +63,21 @@ body.toplevel_page_aksrt-settings #collapse-menu {
 
 @media screen and (max-width: 782px) {
   /* 隐藏 WP 后台默认顶栏的多余间距 */
-  body.toplevel_page_aksrt-settings #wpbody {
+  body.toplevel_page_jio-settings #wpbody {
     padding-top: 0;
   }
 
-  body.toplevel_page_aksrt-settings #wpcontent {
+  body.toplevel_page_jio-settings #wpcontent {
     margin-left: 0 !important;
   }
 
-  #aksrt-admin-app,
-  #aksrt-admin-app:empty::before {
+  #jio-admin-app,
+  #jio-admin-app:empty::before {
     min-height: calc(100vh - 46px);
   }
 
   /* 移动端把 WP 折叠菜单按钮藏掉，避免与自定义菜单按钮重叠 */
-  body.toplevel_page_aksrt-settings #wp-admin-bar-menu-toggle {
+  body.toplevel_page_jio-settings #wp-admin-bar-menu-toggle {
     display: none;
   }
 }