fix(RHI): 添加 OpenGL 源文件到 CMakeLists 并修复编译错误

- 添加 OpenGL RHI 所有源文件到 engine/CMakeLists.txt
- 修复 OpenGLPipelineState 结构体重定义问题
- 修复 BufferDesc/TextureDesc/ShaderCompileDesc API 不匹配
- 添加 OpenGLShader 缺少的基类纯虚函数实现
- 修复 HashMap 迭代器支持和 ResourceManager API 调用

tests/RHI/OpenGL/test_pipeline_state.cpp

@@ -6,7 +6,7 @@ using namespace XCEngine::RHI;
 TEST_F(OpenGLTestFixture, PipelineState_SetDepthStencilState) {
     OpenGLPipelineState pipeline;
     
-    DepthStencilState state;
+    OpenGLDepthStencilState state;
     state.depthTestEnable = true;
     state.depthWriteEnable = true;
     state.depthFunc = ComparisonFunc::Less;
@@ -26,7 +26,7 @@ TEST_F(OpenGLTestFixture, PipelineState_SetDepthStencilState) {
 TEST_F(OpenGLTestFixture, PipelineState_SetBlendState) {
     OpenGLPipelineState pipeline;
     
-    BlendState state;
+    OpenGLBlendState state;
     state.blendEnable = true;
     state.srcBlend = BlendFactor::SrcAlpha;
     state.dstBlend = BlendFactor::InvSrcAlpha;