refactor: delegate signal effects to DisposableBag

Introduce `addEffect` to `DisposableBag` to encapsulate Preact
signal effect creation and disposal. Update `ReactiveScene` to use
this method, simplifying effect management and ensuring proper
cleanup.

packages/framework/src/scenes/ReactiveScene.ts

@@ -1,4 +1,4 @@
-import { effect, type ReadonlySignal } from "@preact/signals-core";
+import { type ReadonlySignal } from "@preact/signals-core";
 import { Scene } from "phaser";
 
 import { DisposableBag, type IDisposable } from "../utils";
@@ -85,6 +85,6 @@ export abstract class ReactiveScene<TData = object>
 
   /** 注册响应式监听（场景关闭时自动清理） */
   public addEffect(fn: () => CleanupFn): void {
-    this.disposables.add(effect(fn));
+    this.disposables.addEffect(fn);
   }
 }