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/base.css

@@ -37,7 +37,7 @@ body {
   background-color: var(--surface-page);
 }
 
-/* zibll compat: global link composite transition */
+/* legacy compat: global link composite transition */
 a[href] {
   transition: color 0.2s, background 0.3s, opacity 0.3s, box-shadow 0.3s, transform 0.3s;
 }
@@ -79,9 +79,9 @@ a[href] {
   flex: 1;
 }
 
-/* Zibll dual-column float math expects a padding-free main.container.
+/* legacy dual-column float math expects a padding-free main.container.
  * Bootstrap 5 also defines .container (max-width ladder + padding-x).
- * Force Zibll geometry after Bootstrap so negative-margin sidebars land correctly. */
+ * Force legacy geometry after Bootstrap so negative-margin sidebars land correctly. */
 .container,
 main.container,
 .site-main.container {
@@ -96,7 +96,7 @@ main.container,
   --bs-gutter-y: 0;
 }
 
-/* Header multifunc icon cards need horizontal gutter (zibll content rows).
+/* Header multifunc icon cards need horizontal gutter (legacy content rows).
  * Global .container padding is 0 for dual-column float math. */
 .header-slider-card.container {
   padding-left: 15px;
@@ -106,7 +106,7 @@ main.container,
 
 /* Header multifunc icon cards: pin typography baseline so cards render
  * identically on all pages. .px12-sm is only defined globally in
- * zibll-utilities.css, which is @import'd by the single-post aggregator;
+ * legacy-utilities.css, which is @import'd by the single-post aggregator;
  * vendor CSS pins it at <=640px / .sidebar / .mobile-nav-widget only. */
 .header-slider-card .icon-cover-card {
   font-size: 12px;
@@ -175,7 +175,7 @@ main.container,
 }
 
 /* Soft pad only when the float dual-column is collapsed.
- * Match Zibll bootstrap container pad (15px) rather than 10px. */
+ * Match legacy bootstrap container pad (15px) rather than 10px. */
 @media (max-width: 991.98px) {
   .container,
   main.container {
@@ -246,7 +246,7 @@ main.container,
 }
 
 /* No-wrap inline name rows — keep the level icon on the same line as the name.
- * The non-standard <name> element (zibll compat) plus .user-name / author-hero /
+ * The non-standard <name> element (legacy compat) plus .user-name / author-hero /
  * uc-header name rows must not flex-wrap, or the badge drops to a new line.
  * The comment header may still wrap (avatar + name + like can overflow on
  * narrow viewports), so it keeps flex-wrap but the inner <name> never does. */