refactor(assets): vendor 资产迁入标准目录并全仓去除 zibll 标识

- assets/vendor 全量迁移: fontawesome5→assets/fontawesome5, css→assets/css,
  js→assets/js/runtime(避开 14 个同名自有文件), img 合并去重→assets/img,
  fonts→assets/fonts; 删除 assets/vendor
- libs 五个与 widgets/third-party 字节相同的库不重复入库, loader paths 改指向
- 运行时切换: _win.uri=assets 根, loader baseUrl=/js/runtime, enlighter 注入
  路径同步; PHP 7 个引用文件切换并改名 $zibll_*→$runtime_*
- 去品牌: Qinver 头注释/品牌 console.log/演示链接清除, 默认文案中性化
- 功能标识符改名: zib__→aksrt__, zib_ajax→aksrt_ajax, window.zib→
  window.aksrtLegacy, zibllblock/*→aksrtblock/*, .zib-widget→.aksrt-panel,
  .zib-slider→.aksrt-slider, zib_menu_options meta 键等
- 自有 CSS 改名: legacy-utilities/compat-vars/footer shell
- admin SPA 重建; 契约测试同步(路径/断言/文件更名)
- 例外保留: tests/visual 对照环境与 fixtures 前缀(外部 Zibll 产品引用)

验证: php -l 133 个改动文件通过; runtime 86 个 JS node --check 通过;
契约测试 68/70(2 个失败经 stash 对照确认为存量问题)

src/Core/PostMetaBox.php

@@ -27,7 +27,7 @@ class PostMetaBox {
         add_action('quick_edit_custom_box', [$this, 'render_quick_edit'], 10, 2);
         add_action('bulk_edit_custom_box', [$this, 'render_quick_edit'], 10, 2);
         add_action('admin_footer-edit.php', [$this, 'admin_quick_edit_script']);
-        // Pay-type dropdown on posts list (zibll zibpay_type filter).
+        // Pay-type dropdown on posts list (legacy aksrtpay_type filter).
         add_action('restrict_manage_posts', [$this, 'render_pay_type_filter']);
         add_action('pre_get_posts', [$this, 'filter_posts_by_pay_type']);
     }
@@ -163,7 +163,7 @@ class PostMetaBox {
             <small class="description"><?php esc_html_e('用于列表多图模式，填写附件 ID（逗号分隔）。', 'aksrt'); ?></small>
         </p>
 
-        <p><strong><?php esc_html_e('侧栏布局（Zibll show_layout）', 'aksrt'); ?></strong></p>
+        <p><strong><?php esc_html_e('侧栏布局（legacy show_layout）', 'aksrt'); ?></strong></p>
         <?php
         $show_layout = (string) get_post_meta($post->ID, '_aksrt_show_layout', true);
         if (!in_array($show_layout, ['no_sidebar', 'sidebar_left', 'sidebar_right'], true)) {
@@ -351,7 +351,7 @@ class PostMetaBox {
         if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) return;
         if (!current_user_can('edit_post', $post_id)) return;
 
-        // Zibll show_layout.
+        // legacy show_layout.
         $show_layout = isset($_POST['aksrt_show_layout']) ? sanitize_key((string) wp_unslash($_POST['aksrt_show_layout'])) : '';
         if (!in_array($show_layout, ['no_sidebar', 'sidebar_left', 'sidebar_right'], true)) {
             $show_layout = '';
@@ -471,7 +471,7 @@ class PostMetaBox {
     }
 
     /**
-     * Content-pay sales summary for posts list (zibll 销售数据 column parity).
+     * Content-pay sales summary for posts list (legacy 销售数据 column parity).
      */
     private function render_sales_column(int $post_id): void {
         if (!function_exists('aksrt_get_pay_meta') || !class_exists('AKSRT\\Core\\DomainModel')) {