添加 Components 和 Scene 序列化支持

- Component: 添加 Serialize/Deserialize 虚函数
- TransformComponent: 实现 Transform 数据的序列化/反序列化
- GameObject: 实现对象序列化/反序列化
- Scene: 实现 Save/Load 方法，支持场景文件保存和加载
- 测试: 添加 Save_And_Load 和 Save_ContainsGameObjectData 测试

tests/Scene/test_scene.cpp

@@ -2,8 +2,12 @@
 #include <XCEngine/Scene/Scene.h>
 #include <XCEngine/Components/GameObject.h>
 #include <XCEngine/Components/TransformComponent.h>
+#include <XCEngine/Math/Vector3.h>
+#include <fstream>
+#include <sstream>
 
 using namespace XCEngine::Components;
+using namespace XCEngine::Math;
 
 namespace {
 
@@ -214,4 +218,34 @@ TEST_F(SceneTest, OnGameObjectDestroyed_Event) {
     EXPECT_TRUE(eventFired);
 }
 
+TEST_F(SceneTest, Save_And_Load) {
+    GameObject* go = testScene->CreateGameObject("SavedObject");
+    go->GetTransform()->SetLocalPosition(XCEngine::Math::Vector3(1.0f, 2.0f, 3.0f));
+    go->SetActive(true);
+    
+    testScene->Save("test_scene.scene");
+    
+    Scene loadedScene;
+    loadedScene.Load("test_scene.scene");
+    
+    GameObject* loadedGo = loadedScene.Find("SavedObject");
+    EXPECT_NE(loadedGo, nullptr);
+    EXPECT_EQ(loadedGo->GetTransform()->GetLocalPosition(), XCEngine::Math::Vector3(1.0f, 2.0f, 3.0f));
+}
+
+TEST_F(SceneTest, Save_ContainsGameObjectData) {
+    testScene->CreateGameObject("Player");
+    testScene->CreateGameObject("Enemy");
+    
+    testScene->Save("test_scene_multi.scene");
+    
+    std::ifstream file("test_scene_multi.scene");
+    std::stringstream buffer;
+    buffer << file.rdbuf();
+    std::string content = buffer.str();
+    
+    EXPECT_TRUE(content.find("Player") != std::string::npos);
+    EXPECT_TRUE(content.find("Enemy") != std::string::npos);
+}
+
 } // namespace