feat(scene): 添加环绕场景过渡处理器注册功能

[GeWuYou]

• 实现 RegisterAroundHandler 方法用于注册环绕场景过渡处理器
• 实现 UnregisterAroundHandler 方法用于注销环绕场景过渡处理器
• 添加处理器选项配置参数支持
• 提供完整的环绕处理器生命周期管理功能

Summary by Sourcery

Add support in the scene router for registering and unregistering around-scene transition handlers with optional configuration.

New Features:

• Introduce RegisterAroundHandler on SceneRouterBase to register around-scene transition handlers with optional handler options.
• Introduce UnregisterAroundHandler on SceneRouterBase to unregister previously registered around-scene transition handlers.

[sourcery-ai]

Reviewer's Guide

Expose registration and unregistration APIs on SceneRouterBase for around-scene transition handlers, delegating to the underlying pipeline with optional handler options, to support full lifecycle management of around transition handlers.

Sequence diagram for registering and unregistering around scene transition handlers

sequenceDiagram
actor Client
participant SceneRouterBase
participant SceneTransitionPipeline
participant ISceneAroundTransitionHandler as AroundHandler
participant SceneTransitionHandlerOptions as HandlerOptions

Client->>SceneRouterBase: RegisterAroundHandler(AroundHandler, HandlerOptions)
SceneRouterBase->>SceneTransitionPipeline: RegisterAroundHandler(AroundHandler, HandlerOptions)
SceneTransitionPipeline-->>Client: registrationCompleted

Client->>SceneRouterBase: UnregisterAroundHandler(AroundHandler)
SceneRouterBase->>SceneTransitionPipeline: UnregisterAroundHandler(AroundHandler)
SceneTransitionPipeline-->>Client: unregistrationCompleted

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Class diagram for new around scene transition handler lifecycle APIs

classDiagram
class SceneRouterBase {
  -SceneTransitionPipeline _pipeline
  +RegisterHandler(ISceneTransitionHandler handler, SceneTransitionHandlerOptions options)
  +UnregisterHandler(ISceneTransitionHandler handler)
  +RegisterAroundHandler(ISceneAroundTransitionHandler handler, SceneTransitionHandlerOptions options)
  +UnregisterAroundHandler(ISceneAroundTransitionHandler handler)
}

class SceneTransitionPipeline {
  +RegisterHandler(ISceneTransitionHandler handler, SceneTransitionHandlerOptions options)
  +UnregisterHandler(ISceneTransitionHandler handler)
  +RegisterAroundHandler(ISceneAroundTransitionHandler handler, SceneTransitionHandlerOptions options)
  +UnregisterAroundHandler(ISceneAroundTransitionHandler handler)
}

interface ISceneTransitionHandler
interface ISceneAroundTransitionHandler
class SceneTransitionHandlerOptions

SceneRouterBase --> SceneTransitionPipeline : uses
SceneTransitionPipeline ..> ISceneTransitionHandler : manages
SceneTransitionPipeline ..> ISceneAroundTransitionHandler : manages
SceneTransitionPipeline ..> SceneTransitionHandlerOptions : configures

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File-Level Changes

Change	Details	Files
Add around-scene transition handler registration and unregistration methods to the scene router, delegating to the pipeline and supporting optional handler options.	Introduce RegisterAroundHandler method that accepts an ISceneAroundTransitionHandler and optional SceneTransitionHandlerOptions and forwards them to the pipeline Introduce UnregisterAroundHandler method that accepts an ISceneAroundTransitionHandler and forwards it to the pipeline Document the new methods with XML comments describing their purpose and parameters	GFramework.Game/scene/SceneRouterBase.cs

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider documenting in the XML comments what happens when options is null (e.g., default behavior or defaults applied) so callers understand how the pipeline treats omitted configuration.
• If handler is not expected to be null, you may want to add a guard clause or nullable annotation to RegisterAroundHandler/UnregisterAroundHandler to align with how other handler registration methods enforce parameter validity.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider documenting in the XML comments what happens when `options` is `null` (e.g., default behavior or defaults applied) so callers understand how the pipeline treats omitted configuration.
- If `handler` is not expected to be `null`, you may want to add a guard clause or nullable annotation to `RegisterAroundHandler`/`UnregisterAroundHandler` to align with how other handler registration methods enforce parameter validity.

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