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/WidgetSystem/AssetManager.php

@@ -66,7 +66,7 @@ final class AssetManager {
 
 	private static function enqueue_optional(string $asset): void {
 		if ($asset === 'swiper') {
-			// Zibll main.js owns the single Swiper runtime and discovers .new-swiper.
+			// legacy main.js owns the single Swiper runtime and discovers .new-swiper.
 		} elseif ($asset === 'dplayer') {
 			wp_enqueue_script('aksrt-widget-dplayer');
 		} elseif (in_array($asset, ['hls', 'flv', 'dash'], true)) {

src/WidgetSystem/FrontendRenderer.php

@@ -23,9 +23,9 @@ final class FrontendRenderer {
 		}
 
 		AssetManager::enqueue_for($definition);
-		$classes = ['aksrt-widget', 'zib-widget-wrap', 'aksrt-widget--' . $definition->slug(), 'aksrt-widget--' . $definition->size()];
+		$classes = ['aksrt-widget', 'aksrt-panel-wrap', 'aksrt-widget--' . $definition->slug(), 'aksrt-widget--' . $definition->size()];
 		if ($definition->size() === 'sidebar' && $definition->slug() !== 'user_card') {
-			$classes[] = 'zib-widget';
+			$classes[] = 'aksrt-panel';
 		}
 		$device_class = WidgetVisibility::device_class($instance);
 		if ($device_class !== '') {