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/content/FooterTabbarSettings.vue

@@ -1,5 +1,5 @@
 <template>
-  <div class="aksrt-page-container content-page">
+  <div class="jio-page-container content-page">
     <PageHeader title="底部Tab配置" desc="自定义移动端底部导航栏的按钮，支持排序、图标配置和返回顶部功能。">
       <template #actions>
         <n-button type="primary" :loading="saving" @click="handleSave">保存</n-button>
@@ -8,24 +8,24 @@
 
     <n-spin :show="loading" style="width: 100%; min-height: 200px;">
       <!-- 基础设置 -->
-      <n-card class="aksrt-section-card">
+      <n-card class="jio-section-card">
         <template #header>
-          <div class="aksrt-card-header-row">
-            <div class="aksrt-card-header-row__left">
+          <div class="jio-card-header-row">
+            <div class="jio-card-header-row__left">
               <span class="header-icon"><i class="fa fas fa-cog"></i></span>
-              <strong class="aksrt-card-header-row__title">基础设置</strong>
+              <strong class="jio-card-header-row__title">基础设置</strong>
             </div>
           </div>
         </template>
 
-        <n-form :model="form" label-placement="left" label-width="140" class="aksrt-form">
+        <n-form :model="form" label-placement="left" label-width="140" class="jio-form">
           <n-form-item label="启用底部Tab">
             <n-switch v-model:value="form.enabled" />
-            <span class="aksrt-hint-text" style="margin-left: 12px;">移动端底部导航栏总开关</span>
+            <span class="jio-hint-text" style="margin-left: 12px;">移动端底部导航栏总开关</span>
           </n-form-item>
           <n-form-item label="向下滚动隐藏">
             <n-switch v-model:value="form.scroll_down_hide" />
-            <span class="aksrt-hint-text" style="margin-left: 12px;">页面向下滚动时隐藏，向上滚动时显示</span>
+            <span class="jio-hint-text" style="margin-left: 12px;">页面向下滚动时隐藏，向上滚动时显示</span>
           </n-form-item>
           <n-form-item label="文章页专属Tab">
             <n-select
@@ -36,18 +36,18 @@
               ]"
               style="width: 240px;"
             />
-            <span class="aksrt-hint-text" style="margin-left: 12px;">文章详情页底部显示的Tab按钮类型</span>
+            <span class="jio-hint-text" style="margin-left: 12px;">文章详情页底部显示的Tab按钮类型</span>
           </n-form-item>
         </n-form>
       </n-card>
 
       <!-- Tab按钮配置 -->
-      <n-card class="aksrt-section-card">
+      <n-card class="jio-section-card">
         <template #header>
-          <div class="aksrt-card-header-row">
-            <div class="aksrt-card-header-row__left">
+          <div class="jio-card-header-row">
+            <div class="jio-card-header-row__left">
               <span class="header-icon"><i class="fa fas fa-list-ul"></i></span>
-              <strong class="aksrt-card-header-row__title">Tab按钮配置 ({{ form.items.length }})</strong>
+              <strong class="jio-card-header-row__title">Tab按钮配置 ({{ form.items.length }})</strong>
             </div>
             <n-button type="primary" size="small" @click="addItem">
               <template #icon><i class="fa fas fa-plus"></i></template>
@@ -63,27 +63,27 @@
           v-model="form.items"
           v-bind="SORTABLE_LIST_ATTRS"
           item-key="id"
-          class="aksrt-sortable"
+          class="jio-sortable"
           @end="resetSortOrder"
         >
           <template #item="{ element, index }">
-            <div class="aksrt-sortable__item">
-              <div class="aksrt-sortable__head">
-                <AksSortHandle />
-                <span class="aksrt-sortable__icon">
+            <div class="jio-sortable__item">
+              <div class="jio-sortable__head">
+                <JioSortHandle />
+                <span class="jio-sortable__icon">
                   <IconValue v-if="element.icon" :value="element.icon" />
                 </span>
-                <div class="aksrt-sortable__main">
-                  <div class="aksrt-sortable__title-row">
-                    <span class="aksrt-sortable__title">{{ element.text || '按钮' }}</span>
+                <div class="jio-sortable__main">
+                  <div class="jio-sortable__title-row">
+                    <span class="jio-sortable__title">{{ element.text || '按钮' }}</span>
                     <n-tag size="small" :bordered="false">{{ typeLabelMap[element.type] || element.type }}</n-tag>
                     <n-tag v-if="element.badge" size="small" type="error" :bordered="false">徽标 {{ element.badge }}</n-tag>
                     <n-tag v-if="element.type === 'home' && element.ontop" size="small" type="success" :bordered="false">返回顶部</n-tag>
                     <n-tag size="small" :type="element.enabled ? 'success' : 'default'" :bordered="false">{{ element.enabled ? '启用' : '禁用' }}</n-tag>
                   </div>
-                  <div class="aksrt-sortable__desc">{{ getItemSummary(element) }}</div>
+                  <div class="jio-sortable__desc">{{ getItemSummary(element) }}</div>
                 </div>
-                <div class="aksrt-sortable__actions">
+                <div class="jio-sortable__actions">
                   <n-button size="tiny" quaternary type="primary" @click="editItem(index)">
                     <template #icon><i class="fa fas fa-edit" style="font-size:12px;" /></template>
                     编辑
@@ -100,7 +100,7 @@
         <n-empty v-else description="暂无Tab按钮，请点击上方按钮添加" />
       </n-card>
 
-      <div class="aksrt-form-actions">
+      <div class="jio-form-actions">
         <n-button type="primary" :loading="saving" @click="handleSave">保存底部Tab配置</n-button>
       </div>
     </n-spin>
@@ -111,10 +111,10 @@
       :mask-closable="false"
       preset="card"
       :title="editingIndex >= 0 ? '编辑Tab按钮' : '添加Tab按钮'"
-      class="aksrt-modal-card"
+      class="jio-modal-card"
       style="max-width: 520px;"
     >
-      <n-form :model="editingItem" label-placement="top" class="aksrt-form">
+      <n-form :model="editingItem" label-placement="top" class="jio-form">
         <n-form-item label="按钮类型">
           <n-select
             v-model:value="editingItem.type"
@@ -214,12 +214,12 @@
               v-model="editingItem.add_items"
               v-bind="SORTABLE_LIST_ATTRS"
               item-key="id"
-              class="aksrt-sortable aksrt-sortable--compact"
+              class="jio-sortable jio-sortable--compact"
             >
               <template #item="{ element, index: subIndex }">
-                <div class="aksrt-sortable__item">
-                  <div class="aksrt-sortable__head add-items-editor__row">
-                    <AksSortHandle />
+                <div class="jio-sortable__item">
+                  <div class="jio-sortable__head add-items-editor__row">
+                    <JioSortHandle />
                     <n-input v-model:value="element.label" placeholder="名称，例如：写文章" />
                     <FaIconPicker v-model="element.icon" placeholder="选择图标" />
                     <n-input v-model:value="element.url" placeholder="链接，例如：/wp-admin/post-new.php" />
@@ -236,7 +236,7 @@
 
         <n-form-item v-if="editingItem.type === 'home'" label="返回顶部功能">
           <n-switch v-model:value="editingItem.ontop" />
-          <span class="aksrt-hint-text" style="margin-left: 12px;">页面滚动后切换为返回顶部按钮</span>
+          <span class="jio-hint-text" style="margin-left: 12px;">页面滚动后切换为返回顶部按钮</span>
         </n-form-item>
 
         <n-form-item label="启用状态">
@@ -245,7 +245,7 @@
       </n-form>
 
       <template #footer>
-        <div class="aksrt-modal-footer">
+        <div class="jio-modal-footer">
           <n-button @click="showModal = false">取消</n-button>
           <n-button type="primary" @click="saveItem">保存</n-button>
         </div>
@@ -262,7 +262,7 @@ import api from '@/api'
 import PageHeader from '@/components/PageHeader.vue'
 import FaIconPicker from '@/components/form/FaIconPicker.vue'
 import IconValue from '@/components/form/IconValue.vue'
-import AksSortHandle from '@/components/form/AksSortHandle.vue'
+import JioSortHandle from '@/components/form/JioSortHandle.vue'
 import { SORTABLE_LIST_ATTRS } from '@/components/form/sortable-options.js'
 
 const message = useMessage()
@@ -606,7 +606,7 @@ onMounted(loadSettings)
 }
 
 .icon-preview-row a {
-  color: var(--aksrt-color-primary, #18A058);
+  color: var(--jio-color-primary, #18A058);
   text-decoration: none;
 }
 
@@ -615,12 +615,12 @@ onMounted(loadSettings)
 }
 
 .muted-text {
-  color: var(--aksrt-color-muted, #6F7A72);
+  color: var(--jio-color-muted, #6F7A72);
   font-size: 12px;
 }
 
 .section-desc {
-  color: var(--aksrt-color-muted, #6F7A72);
+  color: var(--jio-color-muted, #6F7A72);
   font-size: 13px;
   margin: 0 0 16px;
 }
@@ -650,7 +650,7 @@ onMounted(loadSettings)
 
 .add-items-editor__presets-label {
   font-size: 12px;
-  color: var(--aksrt-color-muted, #6F7A72);
+  color: var(--jio-color-muted, #6F7A72);
 }
 
 .add-items-editor__row {