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/author-actions.css

@@ -104,7 +104,7 @@
     margin-bottom: 16px;
 }
 
-/* Zibll .post-actions — text/icon column buttons, not pill chips */
+/* legacy .post-actions — text/icon column buttons, not pill chips */
 .post-actions-card,
 .post-actions {
     position: relative;
@@ -124,7 +124,7 @@
     margin-bottom: 12px;
 }
 
-/* Legacy card-buttons flex only for non-zibll card variant */
+/* Legacy card-buttons flex only for non-legacy card variant */
 .post-actions-card__buttons {
     display: flex;
     justify-content: center;
@@ -132,7 +132,7 @@
     margin-bottom: 12px;
 }
 
-/* Zibll: .article .action { width:80px; padding:10px 0; inline-block; opacity:.7 } */
+/* legacy: .article .action { width:80px; padding:10px 0; inline-block; opacity:.7 } */
 .article .action,
 .post-actions .action {
     width: 80px;
@@ -406,7 +406,7 @@ html.dark .post-drop-meta__item:hover {
     color: #fff;
 }
 
-/* ===== Author Card — 对齐 zibll 卡片容器 ===== */
+/* ===== Author Card — 对齐 legacy 卡片容器 ===== */
 .author-box {
     margin-bottom: 16px;
     padding: 18px;
@@ -554,7 +554,7 @@ html.dark .post-drop-meta__item:hover {
 
 
 
-/* ===== Zibll single-metabox / author bar ===== */
+/* ===== legacy single-metabox / author bar ===== */
 .article-avatar .user-info {
   width: 100%;
 }
@@ -622,7 +622,7 @@ html.dark .post-drop-meta__item:hover {
   --body-bg-color: rgba(0, 0, 0, 0.3);
 }
 
-/* line-form-line owned by zibll-utilities.css — only context here */
+/* line-form-line owned by legacy-utilities.css — only context here */
 .article-avatar .line-form-line {
   display: block;
 }
@@ -635,7 +635,7 @@ html.dark .post-drop-meta__item:hover {
 .article-tags .but.c-red { color: #f44336; }
 
 
-/* ===== Zibll user-card after-box ===== */
+/* ===== legacy user-card after-box ===== */
 .user-card.author { margin-bottom: 16px; overflow: hidden; }
 .user-card.author .user-avatar { display: flex; justify-content: center; }
 .user-card.author .user-avatar .avatar,