[Bug]: iOS 集成问题

### 请描述遇到的问题，以及您所期望的正确的结果

项目为纯 flutter 项目，看给的 demo 也是。
项目原本在AppDelegate didFinishLaunchingWithOptions中调用 [GeneratedPluginRegistrant registerWithRegistry:self]; ，但是看源码，源码内部有registerWithRegistry 传递了self.engine ，这样就导致注册两次，然后项目能正常跑起来。但是跳转时候，发现无法跳转，FlutterBoostPlugin 是一个新的，delegate 为 nil.
如果不手动调用 [GeneratedPluginRegistrant registerWithRegistry:self]; 只使用源码中的注册，那么其他插件报错。

### 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

[VERBOSE-2:dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(channel-error, Unable to establish connection on channel., null, null)
#0 PathProviderApi.getDirectoryPath (package:path_provider_foundation/messages.g.dart:40:7)

#1 getApplicationDocumentsDirectory (package:path_provider/path_provider.dart:121:24)

### 复现的平台

iOS

### Flutter SDK版本

3.10.5

### FlutterBoost版本

4.3.0

### 是否延迟初始化FlutterBoost

No

### 解决方案

Start with AppDelegate's didFinishLaunchingWithOptions and the two registration paths: GeneratedPluginRegistrant.registerWithRegistry:self and FlutterBoostPlugin's registration using self.engine. Then inspect the reported path_provider_foundation/messages.g.dart channel error on iOS. Done means identifying a single correct registration flow that preserves FlutterBoost navigation and other plugin channels.

Written by the indexing model from the issue text.