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)

templates/parts/single-author-bar.php

@@ -1,12 +1,12 @@
 <?php
 /**
- * Shared author info bar for single post content (Zibll article-avatar / user-info).
+ * Shared author info bar for single post content (legacy article-avatar / user-info).
  *
  * Contract: get_template_part(..., null, $args)
  *   show_actions  bool  Follow / PM buttons + meta row
  *   show_bio      bool  Append bio after time
  *   show_time     bool  Relative publish/update time (default true)
- *   meta_html     string Prebuilt Zibll single-metabox HTML
+ *   meta_html     string Prebuilt legacy single-metabox HTML
  *   meta_items    array  Legacy text meta items (fallback)
  *   extra_class   string
  *
@@ -48,7 +48,7 @@ $aksrt_msg_url = function_exists('aksrt_get_messages_page_url') ? aksrt_get_mess
 $login_url = function_exists('aksrt_get_login_url') ? aksrt_get_login_url() : wp_login_url(get_permalink());
 $is_self = is_user_logged_in() && get_current_user_id() === $author_id;
 
-// Identity: prefer aksrt_get_user_name (Zibll order); fall back to chips.
+// Identity: prefer aksrt_get_user_name (legacy order); fall back to chips.
 	$identity_chips = '';
 	$name_html = '';
 	if (function_exists('aksrt_get_user_name')) {