Remove RHI interface inheritance from all D3D12 backend classes
- D3D12Device, D3D12CommandQueue, D3D12CommandAllocator, D3D12Fence
- D3D12DescriptorHeap, D3D12QueryHeap, D3D12RootSignature
- D3D12PipelineState, D3D12Sampler, D3D12Shader
- D3D12Buffer, D3D12Texture, D3D12SwapChain
All D3D12 backend classes now directly use D3D12 APIs without
going through RHI interface abstraction. This decouples the
D3D12 backend from the RHI abstraction layer.
Test: D3D12 rendering test passed (screenshot comparison 100% match)
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