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/pages/tools/ToolsImportExport.vue

@@ -1,5 +1,5 @@
 <template>
-  <div class="aksrt-page-container">
+  <div class="jio-page-container">
     <PageHeader
       title="导入导出"
       desc="导出当前设置快照、执行 dry-run 导入校验，并支持按域重置到 schema 默认值。"
@@ -12,8 +12,8 @@
       </template>
     </PageHeader>
 
-    <n-card class="aksrt-section-card">
-      <div class="aksrt-section-header">
+    <n-card class="jio-section-card">
+      <div class="jio-section-header">
         <h3>导出与导入</h3>
       </div>
       <n-space style="margin-bottom: 16px;">
@@ -27,13 +27,13 @@
         :autosize="{ minRows: 12, maxRows: 20 }"
         placeholder="导出的 JSON 会出现在这里，也可以直接粘贴导入。"
       />
-      <p class="aksrt-tools-hint">
+      <p class="jio-tools-hint">
         正式导入前会自动创建一份“导入前自动快照”，与“数据备份”页的快照体系共用，便于回滚。
       </p>
     </n-card>
 
-    <n-card class="aksrt-section-card">
-      <div class="aksrt-section-header">
+    <n-card class="jio-section-card">
+      <div class="jio-section-header">
         <h3>按域重置</h3>
       </div>
       <n-space align="center" wrap>
@@ -41,14 +41,14 @@
         <n-button :loading="resetting" @click="handleReset">重置所选域</n-button>
         <n-button type="error" tertiary :loading="resettingAll" @click="handleResetAll">重置全部</n-button>
       </n-space>
-      <p class="aksrt-tools-hint">仅支持重置 schema 托管的业务域。健康检查和迁移状态属于运维面板，不参与按域回滚。</p>
+      <p class="jio-tools-hint">仅支持重置 schema 托管的业务域。健康检查和迁移状态属于运维面板，不参与按域回滚。</p>
     </n-card>
 
-    <n-card class="aksrt-section-card">
-      <div class="aksrt-section-header">
+    <n-card class="jio-section-card">
+      <div class="jio-section-header">
         <h3>最近结果</h3>
       </div>
-      <pre class="aksrt-tools-output">{{ resultText || '尚未执行操作。' }}</pre>
+      <pre class="jio-tools-output">{{ resultText || '尚未执行操作。' }}</pre>
     </n-card>
   </div>
 </template>
@@ -169,7 +169,7 @@ async function handleResetAll() {
 </script>
 
 <style scoped>
-.aksrt-tools-output {
+.jio-tools-output {
   margin: 0;
   padding: 14px;
   border-radius: 12px;
@@ -181,7 +181,7 @@ async function handleResetAll() {
   word-break: break-word;
 }
 
-.aksrt-tools-hint {
+.jio-tools-hint {
   margin: 12px 0 0;
   color: #667085;
   font-size: 12px;