feat: 实现D3D12Device类，整合D3D12Enum.h转换函数

- 简化D3D12Device，仅封装ID3D12Device和IDXGIFactory
- 将D3D12Common.h中的转换函数合并到D3D12Enum.h
- 添加ResourceStates枚举到Enums.h
- 更新测试项目使用新的D3D12Device类
- 更新CMake配置

engine/CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.15)
-project(XCEngine)
+project(XCEngineLib)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
@@ -83,6 +83,9 @@ add_library(XCEngine STATIC
 
     # RHI
     include/XCEngine/RHI/Enums.h
+    include/XCEngine/RHI/D3D12/D3D12Enum.h
+    include/XCEngine/RHI/D3D12/D3D12Device.h
+    src/RHI/D3D12Device.cpp
 )
 
 target_include_directories(XCEngine PUBLIC