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/comments/form-parts.php

@@ -1,9 +1,9 @@
 <?php
 /**
- * Comment form partials — virtual-input + expand toolbar (Zibll DOM contract).
+ * Comment form partials — virtual-input + expand toolbar (legacy DOM contract).
  *
- * Mirrors zib_get_respond_mobile() and zib_get_input_expand_but()
- * from zibll/inc/functions.
+ * Mirrors legacy() and legacy()
+ * from legacy/inc/functions.
  *
  * @package AKSRT
  */
@@ -12,7 +12,7 @@ defined('ABSPATH') || exit;
 
 if (!function_exists('aksrt_get_comment_virtual_input_html')) :
 	/**
-	 * Mobile virtual input bar (zibll: zib_get_respond_mobile).
+	 * Mobile virtual input bar (legacy: legacy).
 	 *
 	 * @param string $placeholder Placeholder text.
 	 * @param string $target      CSS selector for the FixedInput target.
@@ -37,7 +37,7 @@ endif;
 
 if (!function_exists('aksrt_get_input_expand_but')) :
 	/**
-	 * zibll-style expand toolbar button + dropdown (zibll: zib_get_input_expand_but).
+	 * legacy-style expand toolbar button + dropdown (legacy: legacy).
 	 *
 	 * @param string              $type smilie|code|image|quick|link.
 	 * @param mixed               $arg1 Type-specific arg.
@@ -124,7 +124,7 @@ endif;
 
 if (!function_exists('aksrt_render_comment_expand_toolbar')) :
 	/**
-	 * Render left-side expand tools based on settings (zibll order: smilie/code/image/link/quick).
+	 * Render left-side expand tools based on settings (legacy order: smilie/code/image/link/quick).
 	 *
 	 * @param array<string,mixed> $ctx Comments context.
 	 */