feat: 实现D3D12Fence封装

- 添加D3D12Fence类封装ID3D12Fence
- 包含Signal/Wait/GetCompletedValue等同步功能
- 更新测试项目使用新的封装类

engine/include/XCEngine/RHI/D3D12/D3D12Fence.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <d3d12.h>
+#include <wrl/client.h>
+
+#include <cstdint>
+
+using Microsoft::WRL::ComPtr;
+
+namespace XCEngine {
+namespace RHI {
+
+class D3D12Fence {
+public:
+    D3D12Fence();
+    ~D3D12Fence();
+
+    bool Initialize(ID3D12Device* device, uint64_t initialValue = 0);
+    void Shutdown();
+
+    void Signal(uint64_t value);
+    void Wait(uint64_t value);
+    uint64_t GetCompletedValue();
+    void* GetEventHandle() { return m_eventHandle; }
+
+    ID3D12Fence* GetFence() const { return m_fence.Get(); }
+
+private:
+    ComPtr<ID3D12Fence> m_fence;
+    void* m_eventHandle;
+};
+
+} // namespace RHI
+} // namespace XCEngine