RHI: Fix view type signatures in CommandList abstraction

- Unified RHICommandList interface to use RHIResourceView* for all view types
- Fixed OpenGLCommandList override signatures (SetVertexBuffers, SetIndexBuffer, etc.)
- Fixed D3D12CommandList by removing duplicate SetVertexBuffer methods
- Updated OpenGLCommandList.cpp to match new signatures
- Build and all 845 tests pass

engine/include/XCEngine/RHI/RHIResource.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include "RHITypes.h"
+#include "RHIEnums.h"
+
+namespace XCEngine {
+namespace RHI {
+
+class RHIResource {
+public:
+    virtual ~RHIResource() = default;
+
+    virtual void* GetNativeHandle() = 0;
+    virtual ResourceStates GetState() const = 0;
+    virtual void SetState(ResourceStates state) = 0;
+};
+
+} // namespace RHI
+} // namespace XCEngine