refactor(RHI): remove void* from CommandList interfaces and fix OpenGL MRT bug

- Remove void* parameters from RHICommandList abstract interface
- TransitionBarrier, SetVertexBuffer, SetIndexBuffer, SetRenderTargets,
  ClearRenderTarget, ClearDepthStencil, CopyResource now use RHIResourceView*
- SetPipelineState now uses RHIPipelineState* instead of void*
- Simplified SetVertexBuffer to 3 params, SetIndexBuffer to 2 params
- Add internal D3D12 APIs for native type support (low-level escape hatch)
- Fix OpenGL SetRenderTargets to call glDrawBuffers for MRT support
- Update tests to match new interface signatures

All 289 RHI tests pass (158 unit + 64 OpenGL backend + 58 D3D12 backend + 8 integration + 1 disabled)

engine/src/RHI/D3D12/D3D12Device.cpp

@@ -468,11 +468,28 @@ D3D12DescriptorHeap* D3D12Device::CreateDescriptorHeap(const DescriptorHeapDesc&
 }
 
 D3D12QueryHeap* D3D12Device::CreateQueryHeap(const QueryHeapDesc& desc) {
-    return nullptr;
+    auto* queryHeap = new D3D12QueryHeap();
+    if (!queryHeap->Initialize(m_device.Get(), static_cast<QueryType>(desc.queryType), desc.count)) {
+        delete queryHeap;
+        return nullptr;
+    }
+    return queryHeap;
 }
 
 D3D12RootSignature* D3D12Device::CreateRootSignature(const RootSignatureDesc& desc) {
-    return nullptr;
+    auto* rootSig = new D3D12RootSignature();
+    
+    D3D12_ROOT_SIGNATURE_DESC rootSigDesc = {};
+    rootSigDesc.NumParameters = 0;
+    rootSigDesc.NumStaticSamplers = 0;
+    rootSigDesc.Flags = D3D12_ROOT_SIGNATURE_FLAG_ALLOW_INPUT_ASSEMBLER_INPUT_LAYOUT;
+    
+    if (!rootSig->Initialize(m_device.Get(), rootSigDesc)) {
+        delete rootSig;
+        return nullptr;
+    }
+    
+    return rootSig;
 }
 
 D3D12CommandQueue* D3D12Device::CreateCommandQueueImpl(const CommandQueueDesc& desc) {