[Bug]: iOS手势侧滑返回，会将所有的Flutter页面关闭

### 请描述遇到的问题，以及您所期望的正确的结果

flutter_boost:
git:
url: 'https://github.com/alibaba/flutter_boost.git'
ref: 'master'

原生Page---> flutter Page1 ---> flutter Page2 ---> flutter Page3

flutter Page3 手势侧滑----> 原生Page ， 期望侧滑回到 flutter Page2 , flutter Page2 侧滑----> flutter Page1 侧滑 -----> 原生Page

### 请说明如何操作会遇到上述问题

_No response_

### 在下面填入关键复现代码

```
```

### 复现的平台

iOS

### Flutter SDK版本

3.16.5

### FlutterBoost版本

master分支

### 是否延迟初始化FlutterBoost

No

### 解决方案

Start by reproducing the iOS navigation sequence described in the issue with Flutter SDK 3.16.5 and FlutterBoost master. Then inspect FlutterBoost’s iOS integration and page-stack handling; the fix is complete when swiping from Flutter Page3 returns to Page2, then Page1, and finally the native page instead of closing all Flutter pages.

Written by the indexing model from the issue text.