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)

inc/helpers/posts-renderer/markup.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Zibll 9.0 article-list DOM contract.
+ * legacy 9.0 article-list DOM contract.
  *
  * @package AKSRT
  */
@@ -130,7 +130,7 @@ if (!function_exists('aksrt_render_post_list')) {
 	/**
 	 * Render the canonical article stream.
 	 *
-	 * @param array<string,mixed> $args  Zibll-shaped list arguments.
+	 * @param array<string,mixed> $args  legacy-shaped list arguments.
 	 * @param WP_Query|null       $query Optional custom query.
 	 */
 	function aksrt_render_post_list(array $args = [], ?WP_Query $query = null, bool $echo = true): string {