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/aksrt-single-aside.php

@@ -20,7 +20,7 @@ if (!function_exists('aksrt_single_render_overview_widget')) :
 		$modified = get_the_modified_date('', $post_id);
 		$overview_items = is_array($ctx['meta_items_secondary'] ?? null) ? $ctx['meta_items_secondary'] : [];
 		?>
-		<section class="zib-widget single-overview-widget" aria-labelledby="single-overview-title">
+		<section class="aksrt-panel single-overview-widget" aria-labelledby="single-overview-title">
 			<h3 id="single-overview-title" class="single-overview-widget__title">
 				<i class="fa fas fa-file-alt" aria-hidden="true"></i>
 				<?php esc_html_e('文章概览', 'aksrt'); ?>
@@ -76,7 +76,7 @@ if (!function_exists('aksrt_single_render_aside')) :
 			<?php endif; ?>
 
 			<?php if (!empty($ctx['show_toc'])) : ?>
-				<div class="zib-widget toc-widget posts-nav-box" data-title="<?php echo esc_attr((string) ($ctx['toc_title'] ?? __('文章目录', 'aksrt'))); ?>">
+				<div class="aksrt-panel toc-widget posts-nav-box" data-title="<?php echo esc_attr((string) ($ctx['toc_title'] ?? __('文章目录', 'aksrt'))); ?>">
 					<h3><?php echo esc_html((string) ($ctx['toc_title'] ?? __('文章目录', 'aksrt'))); ?></h3>
 					<ol class="toc-list"></ol>
 				</div>