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/admin/src/components/MobileTopBar.vue

@@ -1,7 +1,7 @@
 <template>
-  <header class="aksrt-mobile-topbar">
+  <header class="jio-mobile-topbar">
     <button
-      class="aksrt-mobile-topbar__menu"
+      class="jio-mobile-topbar__menu"
       type="button"
       aria-label="打开菜单"
       @click="$emit('toggle')"
@@ -13,35 +13,35 @@
       </svg>
     </button>
 
-    <div class="aksrt-mobile-topbar__title">{{ title }}</div>
+    <div class="jio-mobile-topbar__title">{{ title }}</div>
 
-    <div class="aksrt-mobile-topbar__brand">AK</div>
+    <div class="jio-mobile-topbar__brand">AK</div>
   </header>
 </template>
 
 <script setup>
 defineProps({
-  title: { type: String, default: 'AKSRT' },
+  title: { type: String, default: 'Jio' },
 })
 
 defineEmits(['toggle'])
 </script>
 
 <style scoped>
-.aksrt-mobile-topbar {
+.jio-mobile-topbar {
   display: flex;
   align-items: center;
   gap: 10px;
   height: 48px;
   padding: 0 14px;
-  background: var(--aksrt-color-surface);
-  border-bottom: 1px solid var(--aksrt-color-border);
+  background: var(--jio-color-surface);
+  border-bottom: 1px solid var(--jio-color-border);
   position: sticky;
   top: 0;
   z-index: 50;
 }
 
-.aksrt-mobile-topbar__menu {
+.jio-mobile-topbar__menu {
   display: inline-flex;
   align-items: center;
   justify-content: center;
@@ -50,26 +50,26 @@ defineEmits(['toggle'])
   border: none;
   border-radius: 8px;
   background: transparent;
-  color: var(--aksrt-color-text);
+  color: var(--jio-color-text);
   cursor: pointer;
   margin-left: -6px;
 }
 
-.aksrt-mobile-topbar__menu:hover {
-  background: var(--aksrt-color-primary-soft);
+.jio-mobile-topbar__menu:hover {
+  background: var(--jio-color-primary-soft);
 }
 
-.aksrt-mobile-topbar__title {
+.jio-mobile-topbar__title {
   flex: 1 1 auto;
   font-size: 15px;
   font-weight: 600;
-  color: var(--aksrt-color-text);
+  color: var(--jio-color-text);
   white-space: nowrap;
   overflow: hidden;
   text-overflow: ellipsis;
 }
 
-.aksrt-mobile-topbar__brand {
+.jio-mobile-topbar__brand {
   flex: 0 0 auto;
   display: inline-flex;
   align-items: center;
@@ -77,7 +77,7 @@ defineEmits(['toggle'])
   width: 28px;
   height: 28px;
   border-radius: 8px;
-  background: var(--aksrt-color-primary);
+  background: var(--jio-color-primary);
   color: #fff;
   font-size: 11px;
   font-weight: 700;