not support fold surface devices，没有适配折叠屏设置的分窗口显示

折叠屏设备分窗口显示时：按照目前的逻辑，一次只能响应一个页面的操作事件；另外一屏会完全无响应。
期望能适配折叠屏分窗口显示

Start by reproducing the issue on a foldable device using split-window display, then trace FlutterBoost's handling of input events across the two pages. Define completion as both windows responding to their respective page operations without breaking standard displays. No files or tests are identified in the issue, so the relevant entry points must first be located.

Written by the indexing model from the issue text.