3.0最新版本FlutterBoost，每次push一个页面，都会重新build栈内所有页面，问题得不到解决

## Steps to Reproduce

路由表映射关系如下：
static Map routerMap = {
FlutterRouteTable.A: (settings, uniqueId) {
return CupertinoPageRoute(
settings: settings,
builder: (_) {
final params = _getParamsFromSettings(settings);
return buildPage(APage(
params: params,
));
});
},
FlutterRouteTable.B: (settings, uniqueId) {
return CupertinoPageRoute(
settings: settings,
builder: (_) {
final params = _getParamsFromSettings(settings);
return buildPage(BPage(
params: params,
));
});
},
}

先打开Flutter A 页面，再打开Flutter B页面。routerMap中也会执行A的builder函数，相当于重新构造了一次APage，这是正常的吗？

**Flutter Boost Version** v3.0-null-safety-preview.15
**Target Platform:**
**Target OS version/browser:**
**Devices:**

## Logs
add your crash log or something else.

```
```

Start with the routerMap example in the issue and trace the builder callbacks when navigating from page A to page B. Review the 14-comment thread for the expected stack behavior and any platform-specific details, then reproduce it with Flutter Boost v3.0-null-safety-preview.15. Done means the reported navigation behavior is understood and the intended page-rebuild behavior is confirmed or corrected.

Written by the indexing model from the issue text.