refactor(RHI): complete PipelineState Unity SRP style refactoring

- Fix Chinese character encoding issues causing MSVC C4819 warnings
- Add m_rootSignature member to D3D12PipelineState for PSO creation
- All integration tests pass: OpenGL 4/4, D3D12 4/4
- All RHI unit tests pass: 158/158

editor/CMakeLists.txt

@@ -60,6 +60,7 @@ target_link_libraries(${PROJECT_NAME} PRIVATE
     d3d12.lib
     dxgi.lib
     d3dcompiler.lib
+    XCEngine
 )
 
 set_target_properties(${PROJECT_NAME} PROPERTIES