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>

src/Settings/FloatButtons.php

@@ -4,16 +4,16 @@
  *
  * 结构对齐参考主题 float_btn（sortable，固定类型，数组顺序即显示顺序）。
  *
- * @package AKSRT
+ * @package Jio
  */
 
-namespace AKSRT\Settings;
+namespace Jio\Settings;
 
 defined('ABSPATH') || exit;
 
 class FloatButtons {
 
-	public const OPTION = 'aksrt_floating_buttons';
+	public const OPTION = 'jio_floating_buttons';
 
 	/** 固定按钮类型（默认显示顺序）。 */
 	public const TYPES = ['more', 'pay_vip', 'add', 'service_qq', 'service_wechat', 'theme_mode', 'qrcode', 'back_top'];
@@ -39,7 +39,7 @@ class FloatButtons {
 				['type' => 'service_qq', 'pc_s' => false, 'm_s' => false, 'color' => $empty_color, 'qq' => ''],
 				['type' => 'service_wechat', 'pc_s' => true, 'm_s' => true, 'color' => $empty_color, 'wechat_img' => ''],
 				['type' => 'theme_mode', 'pc_s' => false, 'm_s' => false, 'color' => $empty_color],
-				['type' => 'qrcode', 'pc_s' => true, 'm_s' => false, 'color' => $empty_color, 'desc' => __('在手机上浏览此页面', 'aksrt')],
+				['type' => 'qrcode', 'pc_s' => true, 'm_s' => false, 'color' => $empty_color, 'desc' => __('在手机上浏览此页面', 'jio')],
 				['type' => 'back_top', 'pc_s' => true, 'm_s' => true, 'color' => $empty_color],
 			],
 		];
@@ -176,7 +176,7 @@ class FloatButtons {
 
 		switch ($type) {
 			case 'add':
-				$out['icon'] = aksrt_sanitize_icon_value((string) ($item['icon'] ?? ''));
+				$out['icon'] = jio_sanitize_icon_value((string) ($item['icon'] ?? ''));
 				break;
 			case 'service_qq':
 				$out['qq'] = (string) preg_replace('/\D+/', '', (string) ($item['qq'] ?? ''));
@@ -198,7 +198,7 @@ class FloatButtons {
 
 		return [
 			'desc'        => sanitize_text_field((string) ($button['desc'] ?? '')),
-			'icon'        => aksrt_sanitize_icon_value((string) ($button['icon'] ?? '')),
+			'icon'        => jio_sanitize_icon_value((string) ($button['icon'] ?? '')),
 			'link'        => [
 				'url'    => esc_url_raw((string) ($link['url'] ?? '')),
 				'target' => $target === '_blank' ? '_blank' : '',
@@ -218,8 +218,8 @@ class FloatButtons {
 	private static function sanitize_color_group($group): array {
 		$group = is_array($group) ? $group : [];
 		return [
-			'color' => \AKSRT\Core\Color::sanitize($group['color'] ?? '', true),
-			'bg'    => \AKSRT\Core\Color::sanitize($group['bg'] ?? '', true),
+			'color' => \Jio\Core\Color::sanitize($group['color'] ?? '', true),
+			'bg'    => \Jio\Core\Color::sanitize($group['bg'] ?? '', true),
 		];
 	}
 }