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>

inc/helpers/menu-decoration.php

@@ -1,24 +1,24 @@
 <?php
 /**
- * Menu decoration helpers — legacy's aksrt_menu_options contract.
+ * Menu decoration helpers — legacy's jio_menu_options contract.
  *
- * @package AKSRT
+ * @package Jio
  */
 
 defined('ABSPATH') || exit;
 
 /**
- * Read one menu item option from post meta aksrt_menu_options.
+ * Read one menu item option from post meta jio_menu_options.
  *
  * @param int    $id      Menu item ID.
  * @param string $key     Option key.
  * @param mixed  $default Default.
  * @return mixed
  */
-function aksrt_menu_pz(int $id, string $key = '', $default = '') {
+function jio_menu_pz(int $id, string $key = '', $default = '') {
 	static $options = [];
 	if (!isset($options[$id])) {
-		$raw = get_post_meta($id, 'aksrt_menu_options', true);
+		$raw = get_post_meta($id, 'jio_menu_options', true);
 		$options[$id] = is_array($raw) ? $raw : [];
 	}
 	if ($key === '') {
@@ -31,18 +31,18 @@ function aksrt_menu_pz(int $id, string $key = '', $default = '') {
  * @param string $icon_class Icon-picker value (FA5 class, zibsvg- or customsvg-).
  * @param bool   $enabled    Global switch.
  */
-function aksrt_render_menu_icon(string $icon_class, bool $enabled = true): string {
+function jio_render_menu_icon(string $icon_class, bool $enabled = true): string {
 	if (!$enabled || $icon_class === '') {
 		return '';
 	}
 
-	// Sprite/inline values must reach aksrt_icon_markup untouched — the legacy
+	// Sprite/inline values must reach jio_icon_markup untouched — the legacy
 	// FA class padding below would corrupt them (zibsvg-hot → fa fas fa-zibsvg-hot).
 	if (str_starts_with($icon_class, 'zibsvg-')) {
-		return aksrt_icon_markup($icon_class, 'icon mr3 menu-item-icon');
+		return jio_icon_markup($icon_class, 'icon mr3 menu-item-icon');
 	}
 	if (str_starts_with($icon_class, 'customsvg-')) {
-		return aksrt_icon_markup($icon_class, 'mr3 menu-item-icon');
+		return jio_icon_markup($icon_class, 'mr3 menu-item-icon');
 	}
 
 	// legacy uses the Font Awesome 5 `fa` prefix.
@@ -51,7 +51,7 @@ function aksrt_render_menu_icon(string $icon_class, bool $enabled = true): strin
 	} elseif (strpos($icon_class, 'fa-') === 0 && strpos($icon_class, ' ') === false) {
 		$icon_class = 'fa ' . $icon_class;
 	}
-	return aksrt_icon_markup($icon_class, 'mr3 menu-item-icon');
+	return jio_icon_markup($icon_class, 'mr3 menu-item-icon');
 }
 
 /**
@@ -59,7 +59,7 @@ function aksrt_render_menu_icon(string $icon_class, bool $enabled = true): strin
  * @param string $class   Extra class (jb-red etc.).
  * @param bool   $enabled Global switch.
  */
-function aksrt_render_menu_badge(string $text, string $class = '', bool $enabled = true): string {
+function jio_render_menu_badge(string $text, string $class = '', bool $enabled = true): string {
 	if (!$enabled || $text === '') {
 		return '';
 	}