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)

src/Core/FrontSubmitPay.php

@@ -23,13 +23,13 @@ trait FrontSubmitPay {
         }
 
         // Only touch pay meta when the form sent pay fields.
-        $has_pay_payload = isset($data['aksrt_pay']) || isset($data['pay_enabled']) || isset($data['zibpay_s']) || isset($data['pay_type']);
+        $has_pay_payload = isset($data['aksrt_pay']) || isset($data['pay_enabled']) || isset($data['aksrtpay_s']) || isset($data['pay_type']);
         if (!$has_pay_payload) {
             return ['success' => true];
         }
 
         $raw = is_array($data['aksrt_pay'] ?? null) ? $data['aksrt_pay'] : [];
-        $enabled = !empty($data['pay_enabled']) || !empty($data['zibpay_s']);
+        $enabled = !empty($data['pay_enabled']) || !empty($data['aksrtpay_s']);
 
         $existing = function_exists('aksrt_get_pay_meta') ? aksrt_get_pay_meta($post_id) : DomainModel::default_pay_meta();
         $meta     = is_array($existing) ? $existing : DomainModel::default_pay_meta();
@@ -172,7 +172,7 @@ trait FrontSubmitPay {
             if (!is_array($row)) {
                 continue;
             }
-            // Accept zibll-ish keys + AKSRT keys.
+            // Accept legacy-ish keys + AKSRT keys.
             $url = (string) ($row['url'] ?? $row['link'] ?? '');
             $url = esc_url_raw(trim($url));
             if ($url === '') {