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/src/RHI/D3D12Fence.cpp

@@ -0,0 +1,52 @@
+#include "XCEngine/RHI/D3D12/D3D12Fence.h"
+#include <Windows.h>
+
+namespace XCEngine {
+namespace RHI {
+
+D3D12Fence::D3D12Fence()
+    : m_eventHandle(nullptr) {
+}
+
+D3D12Fence::~D3D12Fence() {
+    Shutdown();
+}
+
+bool D3D12Fence::Initialize(ID3D12Device* device, uint64_t initialValue) {
+    HRESULT hResult = device->CreateFence(
+        initialValue,
+        D3D12_FENCE_FLAG_NONE,
+        IID_PPV_ARGS(&m_fence));
+    if (FAILED(hResult)) {
+        return false;
+    }
+
+    m_eventHandle = CreateEvent(nullptr, FALSE, FALSE, nullptr);
+    return m_eventHandle != nullptr;
+}
+
+void D3D12Fence::Shutdown() {
+    if (m_eventHandle) {
+        CloseHandle(m_eventHandle);
+        m_eventHandle = nullptr;
+    }
+    m_fence.Reset();
+}
+
+void D3D12Fence::Signal(uint64_t value) {
+    m_fence->Signal(value);
+}
+
+void D3D12Fence::Wait(uint64_t value) {
+    if (m_fence->GetCompletedValue() < value) {
+        m_fence->SetEventOnCompletion(value, m_eventHandle);
+        WaitForSingleObject(m_eventHandle, INFINITE);
+    }
+}
+
+uint64_t D3D12Fence::GetCompletedValue() {
+    return m_fence->GetCompletedValue();
+}
+
+} // namespace RHI
+} // namespace XCEngine