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

engine/src/Components/TransformComponent.cpp

@@ -2,6 +2,7 @@
 #include "Components/GameObject.h"
 #include "Scene/Scene.h"
 #include <algorithm>
+#include <sstream>
 
 namespace XCEngine {
 namespace Components {
@@ -273,5 +274,47 @@ void TransformComponent::NotifyHierarchyChanged() {
     SetDirty();
 }
 
+void TransformComponent::Serialize(std::ostream& os) const {
+    os << "position=" << m_localPosition.x << "," << m_localPosition.y << "," << m_localPosition.z << ";";
+    os << "rotation=" << m_localRotation.x << "," << m_localRotation.y << "," << m_localRotation.z << "," << m_localRotation.w << ";";
+    os << "scale=" << m_localScale.x << "," << m_localScale.y << "," << m_localScale.z << ";";
+}
+
+void TransformComponent::Deserialize(std::istream& is) {
+    std::string token;
+    
+    while (std::getline(is, token, ';')) {
+        if (token.empty()) continue;
+        
+        size_t eqPos = token.find('=');
+        if (eqPos == std::string::npos) continue;
+        
+        std::string key = token.substr(0, eqPos);
+        std::string value = token.substr(eqPos + 1);
+        
+        if (key == "position") {
+            std::replace(value.begin(), value.end(), ',', ' ');
+            std::istringstream vs(value);
+            float x, y, z;
+            vs >> x >> y >> z;
+            m_localPosition = Math::Vector3(x, y, z);
+        } else if (key == "rotation") {
+            std::replace(value.begin(), value.end(), ',', ' ');
+            std::istringstream vs(value);
+            float x, y, z, w;
+            vs >> x >> y >> z >> w;
+            m_localRotation = Math::Quaternion(x, y, z, w);
+        } else if (key == "scale") {
+            std::replace(value.begin(), value.end(), ',', ' ');
+            std::istringstream vs(value);
+            float x, y, z;
+            vs >> x >> y >> z;
+            m_localScale = Math::Vector3(x, y, z);
+        }
+    }
+    
+    SetDirty();
+}
+
 } // namespace Components
 } // namespace XCEngine