fix(pay): 待支付浮窗无刷新同步

- modal-cache 失效时广播 aksrt:cache:invalidated
- 新增 GET /orders/wait-pay-float 返回浮窗片段
- wait-pay-float.js 监听 orders 标签失效并替换/移除浮窗、重启倒计时
- VIP/充值/下载待支付分支触发 orders 失效

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tools/build-public-assets.mjs

@@ -61,6 +61,7 @@ const runtimePreludeScripts = [
   'assets/js/core/modal-telemetry.js',
   'assets/js/core/request.js',
   'assets/js/core/modal-cache.js',
+  'assets/js/core/wait-pay-float.js',
   'assets/js/core/modal-state.js',
   'assets/js/core/modal-runtime.js',
   'assets/js/core/modal-triggers.js',