fix: resolve header overlap on Dynamic Island iPhones

- app.js 通过 wx.getSystemInfoSync 获取 statusBarHeight 存入 globalData
- 所有12个自定义导航页面的 JS 读取 statusBarHeight
- WXML 通过 style="padding-top: {{statusBarHeight + 24}}px" 动态适配
- 普通手机和灵动岛手机都能正确显示

miniprogram/pages/subscribe-success/subscribe-success.wxml

@@ -1,5 +1,5 @@
 <view class="page">
-  <view class="page-header page-header-green">
+  <view class="page-header page-header-green" style="padding-top: {{statusBarHeight + 24}}px;">
     <view class="page-header-title">订阅成功</view>
     <view class="page-header-subtitle">欢迎使用智能模式</view>
   </view>