fix: 修复截图保存功能和CreateCommittedResource参数问题

- 修复SaveScreenshot函数中D3D12_RESOURCE_DESC的初始化
- 添加完整的SampleDesc和Layout字段
- 修复从PRESENT状态正确转换到COPY_SOURCE进行读取
- 启用D3D12 Debug Layer以获取更好的调试信息
- 添加日志输出到文件以便捕获调试信息

engine/src/RHI/D3D12Device.cpp

@@ -1,4 +1,5 @@
 #include "XCEngine/RHI/D3D12/D3D12Device.h"
+#include <stdio.h>
 
 #ifdef _DEBUG
 #include <dxgidebug.h>
@@ -75,8 +76,7 @@ void D3D12Device::Shutdown() {
 bool D3D12Device::CreateDXGIFactory(bool enableDebugLayer) {
     UINT dxgiFactoryFlags = 0;
 
-#ifdef _DEBUG
-    if (enableDebugLayer) {
+    {
         ID3D12Debug* debugController = nullptr;
         if (SUCCEEDED(D3D12GetDebugInterface(IID_PPV_ARGS(&debugController)))) {
             debugController->EnableDebugLayer();
@@ -84,14 +84,19 @@ bool D3D12Device::CreateDXGIFactory(bool enableDebugLayer) {
             debugController->Release();
         }
     }
-#endif
 
     HRESULT hr = CreateDXGIFactory2(dxgiFactoryFlags, IID_PPV_ARGS(&m_factory));
     return SUCCEEDED(hr);
 }
 
 bool D3D12Device::CreateDevice(IDXGIAdapter1* adapter) {
+    OutputDebugStringA("[DEBUG] CreateDevice: start\n");
     HRESULT hr = D3D12CreateDevice(adapter, D3D_FEATURE_LEVEL_11_0, IID_PPV_ARGS(&m_device));
+    if (FAILED(hr)) {
+        char buf[256];
+        sprintf(buf, "[DEBUG] CreateDevice: D3D12CreateDevice failed! hr=%08X\n", hr);
+        OutputDebugStringA(buf);
+    }
     return SUCCEEDED(hr);
 }