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/Admin/PageConfigMetaBox.php

@@ -1,6 +1,6 @@
 <?php
 /**
- * Per-page Zibll header slider configuration.
+ * Per-page legacy header slider configuration.
  *
  * @package AKSRT
  */
@@ -272,12 +272,12 @@ final class PageConfigMetaBox {
 
 	/** @return list<array<string,mixed>> */
 	private static function slide_defaults(): array {
-		$base = defined('AKSRT_URI') ? trailingslashit(AKSRT_URI) . 'assets/vendor/zibll/img/' : '';
+		$base = defined('AKSRT_URI') ? trailingslashit(AKSRT_URI) . 'assets/img/' : '';
 		$slides = [];
 		foreach (['slider-bg.jpg', 'user_t.jpg'] as $image) {
 			$slides[] = [
 				'background' => $base . $image,
-				'link' => ['url' => 'https://www.zibll.com/', 'target' => '_blank'],
+				'link' => ['url' => home_url('/'), 'target' => '_blank'],
 				'text' => ['desc' => '', 'title' => ''],
 				'text_align' => 'left-bottom', 'text_parallax' => 30,
 				'text_size_m' => 20, 'text_size_pc' => 30,