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)

assets/css/frontend/single-post/related-toc.css

@@ -1,4 +1,4 @@
-/* ===== Zibll article-nav (prev/next) ===== */
+/* ===== legacy article-nav (prev/next) ===== */
 .article-nav {
   display: block;
   width: 100%;
@@ -83,7 +83,7 @@
     overflow: hidden;
 }
 
-/* ===== Related Posts — 对齐 zibll 卡片容器 ===== */
+/* ===== Related Posts — 对齐 legacy 卡片容器 ===== */
 .related-box {
     margin-bottom: 16px;
     overflow: hidden;
@@ -156,7 +156,7 @@
 /* ===== Comment Card Spacing ===== */
 .comments-card { margin-bottom: 16px; }
 
-/* ===== Content Height Clamp (Zibll) ===== */
+/* ===== Content Height Clamp (legacy) ===== */
 .limit-height,
 .wp-posts-content.limit-height {
     position: relative;
@@ -539,7 +539,7 @@ body.single .sidebar .posts-nav-box.toc-widget[data-affix="true"] {
 
 
 
-/* ===== Related list (Zibll-like) ===== */
+/* ===== Related list (legacy-like) ===== */
 .relates .title-theme,
 .related-box .title-theme {
     font-size: 14px;
@@ -577,9 +577,9 @@ body.single .sidebar .posts-nav-box.toc-widget[data-affix="true"] {
 }
 
 
-/* ===== Related (Zibll .relates / .relates-thumb) ===== */
+/* ===== Related (legacy .relates / .relates-thumb) ===== */
 .relates .title-theme { margin-bottom: 0; }
-.relates .zib-widget { padding: 12px 15px; }
+.relates .aksrt-panel { padding: 12px 15px; }
 .relates ul.no-thumb { list-style: none; margin: 0; padding: 0; }
 .relates ul.no-thumb li { padding: 6px 0; border-bottom: 1px dashed var(--color-line, rgba(0,0,0,.06)); }
 .relates ul.no-thumb li:last-child { border-bottom: 0; }