[Bug]: release模式下，Android冷启动应用，设置根路由为flutter页面，第一个页面灰屏

### 请描述遇到的问题，以及您所期望的正确的结果

release模式下，Android冷启动应用，设置根路由为flutter页面，第一个页面灰屏

### 请说明如何操作会遇到上述问题

android冷启动应用

### 在下面填入关键复现代码

'/': (settings, uniqueId) {
return CupertinoPageRoute(
settings: settings,
builder: (_) {
return SplashPage();
});
},

### 复现的平台

Android

### Flutter SDK版本

3.16.4

### FlutterBoost版本

5.0.1

### 是否延迟初始化FlutterBoost

No

### 解决方案

Start by reproducing an Android cold start in release mode with the root route set to the shown Flutter page and FlutterBoost initialization enabled. Use the '/' route and SplashPage example as the entry point; done means the first Flutter page renders instead of showing a gray screen.

Written by the indexing model from the issue text.