refactor(RHI): 完成 Shader uniform 设置迁移到 CommandList

- 删除 RHIShader 的 OpenGL 风格 SetMat4/SetVec3/SetInt 等方法
- 添加 UniformInfo 结构体和 GetUniformInfos/GetUniformInfo 接口
- D3D12Shader 和 OpenGLShader 实现 CacheUniformInfos
- RHICommandList 添加 SetUniform*/SetGlobal* 统一接口
- D3D12 实现 D3D12PipelineLayout 管理 root signature 映射
- 修复 D3D12CommandList::SetPipelineStateInternal 在 Reset 后未重新应用 root signature 的问题
- 更新 OpenGL 集成测试使用新的 SetUniform* API
- 所有单元测试和集成测试通过 (8/8 integration tests)

engine/src/RHI/D3D12/D3D12Device.cpp

@@ -6,6 +6,7 @@
 #include "XCEngine/RHI/D3D12/D3D12DescriptorHeap.h"
 #include "XCEngine/RHI/D3D12/D3D12QueryHeap.h"
 #include "XCEngine/RHI/D3D12/D3D12RootSignature.h"
+#include "XCEngine/RHI/D3D12/D3D12PipelineLayout.h"
 #include "XCEngine/RHI/D3D12/D3D12PipelineState.h"
 #include "XCEngine/RHI/D3D12/D3D12Sampler.h"
 #include "XCEngine/RHI/D3D12/D3D12Texture.h"
@@ -380,6 +381,15 @@ RHIPipelineState* D3D12Device::CreatePipelineState(const GraphicsPipelineDesc& d
     return pso;
 }
 
+RHIPipelineLayout* D3D12Device::CreatePipelineLayout(const RHIPipelineLayoutDesc& desc) {
+    auto* pipelineLayout = new D3D12PipelineLayout();
+    if (!pipelineLayout->InitializeWithDevice(this, desc)) {
+        delete pipelineLayout;
+        return nullptr;
+    }
+    return pipelineLayout;
+}
+
 RHIResourceView* D3D12Device::CreateRenderTargetView(RHITexture* texture, const ResourceViewDesc& desc) {
     auto* view = new D3D12ResourceView();
     auto* d3d12Texture = static_cast<D3D12Texture*>(texture);