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/extract-naive-styles.mjs

@@ -104,7 +104,7 @@ const COMPONENT_STYLES = [
 ]
 
 async function extractStyles() {
-  console.log('\n[AKSRT] 开始提取 NaiveUI 组件样式...\n')
+  console.log('\n[Jio] 开始提取 NaiveUI 组件样式...\n')
 
   const allCss = []
   let successCount = 0
@@ -137,9 +137,9 @@ async function extractStyles() {
       // 静默跳过的后果是组件样式整体缺失（取色器曾因此没有尺寸和边框，糊成一团），
       // 而页面不报错，只能靠肉眼发现。
       if (code === 'ERR_MODULE_NOT_FOUND' || code === 'MODULE_NOT_FOUND') {
-        console.error(`[AKSRT] 样式路径不存在，已跳过: ${componentPath}`)
+        console.error(`[Jio] 样式路径不存在，已跳过: ${componentPath}`)
       } else {
-        console.error(`[AKSRT] 样式提取异常，已跳过: ${componentPath}: ${err && err.message}`)
+        console.error(`[Jio] 样式提取异常，已跳过: ${componentPath}: ${err && err.message}`)
       }
       failCount++
     }
@@ -148,7 +148,7 @@ async function extractStyles() {
   const cssOutput = allCss.join('\n\n')
 
   if (!cssOutput.trim()) {
-    console.warn('[AKSRT] 警告：未提取到任何 NaiveUI 样式！')
+    console.warn('[Jio] 警告：未提取到任何 NaiveUI 样式！')
     return null
   }
 
@@ -165,7 +165,7 @@ ${cssOutput}`
 
   await writeFile(cssFile, fullContent, 'utf-8')
 
-  console.log(`[AKSRT] NaiveUI 样式提取完成:`)
+  console.log(`[Jio] NaiveUI 样式提取完成:`)
   console.log(`  成功: ${successCount} 个组件`)
   console.log(`  跳过: ${failCount} 个组件`)
   console.log(`  输出: ${cssFile}`)
@@ -176,6 +176,6 @@ ${cssOutput}`
 
 // 执行
 extractStyles().catch((err) => {
-  console.error('[AKSRT] 样式提取失败:', err)
+  console.error('[Jio] 样式提取失败:', err)
   process.exit(1)
 })