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/form/JioSelectedOrder.vue

@@ -0,0 +1,53 @@
+<template>
+  <draggable
+    v-model="values"
+    v-bind="SORTABLE_LIST_ATTRS"
+    :item-key="valueKey"
+    :disabled="disabled"
+    class="jio-sortable jio-sortable--compact jio-selected-order"
+  >
+    <template #item="{ element, index }">
+      <div class="jio-sortable__item">
+        <div class="jio-sortable__head">
+          <JioSortHandle />
+          <span class="jio-sortable__index">{{ index + 1 }}</span>
+          <span class="jio-sortable__title">{{ labelOf(element) }}</span>
+        </div>
+      </div>
+    </template>
+  </draggable>
+</template>
+
+<script setup>
+/** 多选 + sortable 的已选值排序列表（select / async_select 下方）。 */
+import { computed } from 'vue'
+import draggable from 'vuedraggable'
+import JioSortHandle from './JioSortHandle.vue'
+import { SORTABLE_LIST_ATTRS } from './sortable-options.js'
+
+const props = defineProps({
+  modelValue: { type: Array, required: true },
+  options: { type: Array, default: () => [] },
+  disabled: { type: Boolean, default: false },
+})
+const emit = defineEmits(['update:modelValue'])
+
+const values = computed({
+  get: () => props.modelValue,
+  set: (next) => emit('update:modelValue', next),
+})
+
+function valueKey(value) {
+  return String(value)
+}
+
+function labelOf(value) {
+  return props.options.find(option => option.value === value)?.label || String(value)
+}
+</script>
+
+<style scoped>
+.jio-selected-order {
+  margin-top: 8px;
+}
+</style>