refactor: RHI抽象层测试支持参数化

- 将RHITestFixture改为TestWithParam<RHIType>，支持D3D12和OpenGL双后端
- 重构RHIFactory.cpp的include结构，修复OpenGL设备创建
- 在CMakeLists.txt中添加XCENGINE_SUPPORT_OPENGL宏定义
- 更新engine/CMakeLists.txt和tests/RHI/unit/CMakeLists.txt
- 将所有TEST_F改为TEST_P以支持参数化测试

测试结果: 138 tests (D3D12: 58 passed / OpenGL: 48 passed)

tests/RHI/unit/test_swap_chain.cpp

@@ -3,7 +3,7 @@
 
 using namespace XCEngine::RHI;
 
-TEST_F(RHITestFixture, SwapChain_Create) {
+TEST_P(RHITestFixture, SwapChain_Create) {
     SwapChainDesc desc = {};
     desc.width = 800;
     desc.height = 600;
@@ -22,7 +22,7 @@ TEST_F(RHITestFixture, SwapChain_Create) {
     delete swapChain;
 }
 
-TEST_F(RHITestFixture, SwapChain_GetCurrentBackBufferIndex) {
+TEST_P(RHITestFixture, SwapChain_GetCurrentBackBufferIndex) {
     SwapChainDesc desc = {};
     desc.width = 800;
     desc.height = 600;
@@ -39,7 +39,7 @@ TEST_F(RHITestFixture, SwapChain_GetCurrentBackBufferIndex) {
     delete swapChain;
 }
 
-TEST_F(RHITestFixture, SwapChain_GetCurrentBackBuffer) {
+TEST_P(RHITestFixture, SwapChain_GetCurrentBackBuffer) {
     SwapChainDesc desc = {};
     desc.width = 800;
     desc.height = 600;
@@ -56,7 +56,7 @@ TEST_F(RHITestFixture, SwapChain_GetCurrentBackBuffer) {
     delete swapChain;
 }
 
-TEST_F(RHITestFixture, SwapChain_Resize) {
+TEST_P(RHITestFixture, SwapChain_Resize) {
     SwapChainDesc desc = {};
     desc.width = 800;
     desc.height = 600;
@@ -72,7 +72,7 @@ TEST_F(RHITestFixture, SwapChain_Resize) {
     delete swapChain;
 }
 
-TEST_F(RHITestFixture, SwapChain_FullscreenState) {
+TEST_P(RHITestFixture, SwapChain_FullscreenState) {
     SwapChainDesc desc = {};
     desc.width = 800;
     desc.height = 600;
@@ -91,7 +91,7 @@ TEST_F(RHITestFixture, SwapChain_FullscreenState) {
     delete swapChain;
 }
 
-TEST_F(RHITestFixture, SwapChain_ShouldClose) {
+TEST_P(RHITestFixture, SwapChain_ShouldClose) {
     SwapChainDesc desc = {};
     desc.width = 800;
     desc.height = 600;