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>

templates/parts/content-gallery.php

@@ -4,7 +4,7 @@
  *
  * 用于文章内嵌画廊块或图片列表展示。
  *
- * @package AKSRT
+ * @package Jio
  * @since 5.0.0
  *
  * @var array $images     图片数组 [{src, alt, caption, width, height}]
@@ -35,7 +35,7 @@ if (empty($images)) return;
                class="content-gallery__link"
                <?php echo $lightbox ? 'data-imgbox="imgbox" box-img="' . esc_url($src) . '"' : ''; ?>
                data-caption="<?php echo esc_attr($caption); ?>">
-                <img<?php echo aksrt_get_lazy_attr('lazy_posts_content', (string) $src, 'content-gallery__img', aksrt_get_lazy_thumb('lg')); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?>
+                <img<?php echo jio_get_lazy_attr('lazy_posts_content', (string) $src, 'content-gallery__img', jio_get_lazy_thumb('lg')); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?>
                      alt="<?php echo esc_attr($alt); ?>"
                      width="<?php echo esc_attr($img['width'] ?? 800); ?>"
                      height="<?php echo esc_attr($img['height'] ?? 600); ?>">