Refactor RenderGraph barrier/state tracking system

Major overhaul of resource barrier and state tracking in RenderGraph:
- Introduce ResourceBarrierData for explicit (layout, access, sync) tracking.
- Separate aliasing and transition barriers; explicit aliasing support.
- Remove BufferHint; infer buffer usage from BufferUsage flags.
- Update TextureAccess/BufferAccess to include usage requirements.
- Improve enums (BarrierSync, BarrierAccess, BarrierLayout) for D3D12 alignment.
- Update D3D12CommandBuffer to use new barrier data and error handling.
- Make D3D12DescriptorHeap a class; add ReleaseSampler to IResourceDatabase.
- Reset resource pools and aliasing managers each frame.
- Batch and flush barriers efficiently per pass.
- Update HLSL mesh shader macros to [NumThreads].
- Remove obsolete code and improve documentation.
This refactor improves correctness, extensibility, and prepares for advanced features.

Ghost.Graphics/D3D12/D3D12SwapChain.cs

@@ -149,7 +149,8 @@ internal unsafe class D3D12SwapChain : ISwapChain
             pBackBuffer->SetName($"SwapChain_BackBuffer_{i}");
 
             var rtv = _descriptorAllocator.AllocateRTV();
-            _renderDevice.NativeDevice.Get()->CreateRenderTargetView(pBackBuffer, null, _descriptorAllocator.GetCpuHandle(rtv));
+            var cpuHandle = _descriptorAllocator.GetCpuHandle(rtv);
+            _renderDevice.NativeDevice.Get()->CreateRenderTargetView(pBackBuffer, null, cpuHandle);
 
             var view = ResourceViewGroup.Invalid with
             {