fix(framework): check instance of Scene in PhaserScene

Ensure the scene passed to PhaserScene is an instance of Phaser.Scene
before deciding whether to instantiate it.

packages/framework/src/ui/PhaserBridge.tsx

@@ -1,5 +1,5 @@
 import { signal, useSignal, useSignalEffect } from "@preact/signals";
-import Phaser, { AUTO } from "phaser";
+import Phaser, { AUTO, Scene } from "phaser";
 import { createContext } from "preact";
 import { useContext, useEffect, useRef } from "preact/hooks";
 
@@ -215,7 +215,8 @@ export function PhaserScene<TData = {}>(props: PhaserSceneProps<TData>) {
     const game = ctx.game;
 
     // 注册场景到 Phaser（但不启动）
-    const scene = "scene" in props.scene ? props.scene : new props.scene();
+    const scene =
+      props.scene instanceof Scene ? props.scene : new props.scene();
     const sceneKey = props.sceneKey ?? scene.sys.settings.key;
     if (!game.scene.getScene(sceneKey)) {
       const initData = {