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/user-center-renderers/profile-credits.php

@@ -2,7 +2,7 @@
 /**
  * User center assets panel orchestrator (wallet + points).
  *
- * Zibll user-tab-balance parity: dual cards + tabbed ledgers.
+ * legacy user-tab-balance parity: dual cards + tabbed ledgers.
  *
  * @package AKSRT
  */
@@ -16,7 +16,7 @@ $dir = __DIR__;
 $show_wallet  = !empty($balance_enabled);
 $show_credits = !empty($credits_enabled);
 
-// Dual cards row (Zibll row gutters-10).
+// Dual cards row (legacy row gutters-10).
 if ($show_wallet || $show_credits) :
 	?>
 	<div class="uc-assets-row<?php echo ($show_wallet && $show_credits) ? ' uc-assets-row--dual' : ''; ?>">
@@ -46,7 +46,7 @@ if ($show_wallet || $show_credits) {
 	require $dir . '/transfer-modal.php';
 }
 
-// Tabbed ledgers (Zibll record tabs).
+// Tabbed ledgers (legacy record tabs).
 if ($show_wallet || $show_credits) :
 	$active_record = $show_wallet ? 'balance' : 'points';
 	$show_tasks = $show_credits && class_exists('\AKSRT\Credits\PointsFree') && \AKSRT\Credits\PointsFree::enabled();