feat(RHI): 实现 RHIBuffer, RHITexture, RHIShader 抽象基类

- 新增 RHIBuffer, RHITexture, RHIShader 抽象基类
- D3D12Buffer/Texture/Shader 继承抽象基类
- OpenGLBuffer/Texture/Shader 继承抽象基类
- 添加 RHICapabilities, RHIDevice 头文件
- RHIEnums 添加 Fragment/TessControl/TessEvaluation
- 文档更新差异处理策略

engine/src/RHI/D3D12/D3D12Shader.cpp

@@ -27,7 +27,7 @@ bool D3D12Shader::CompileFromFile(const wchar_t* filePath, const char* entryPoin
     if (strstr(target, "vs_")) {
         m_type = ShaderType::Vertex;
     } else if (strstr(target, "ps_")) {
-        m_type = ShaderType::Pixel;
+        m_type = ShaderType::Fragment;
     } else if (strstr(target, "gs_")) {
         m_type = ShaderType::Geometry;
     } else if (strstr(target, "cs_")) {