Refactor: add command allocator & render target strategies

Major refactor of graphics infrastructure:
- Introduce ICommandAllocator and D3D12CommandAllocator for explicit command buffer management.
- Change ICommandBuffer.Begin to require an allocator.
- Add IRenderTargetStrategy abstraction with swap chain and texture implementations.
- Update IRenderer to use RenderTargetStrategy instead of direct handle.
- Add DPI scaling support to swap chains (ScaleX/ScaleY, SetScale).
- RenderSystem now supports thread-safe swap chain resize requests.
- Remove persistent copy command buffer; use per-frame allocators.
- Make Logger public/static and clean up API visibility.
- Update .editorconfig and debug layer enablement.
These changes improve modularity, DPI-awareness, and future extensibility.

Ghost.Graphics/RHI/ICommandBuffer.cs

@@ -35,7 +35,7 @@ public interface ICommandBuffer : IDisposable
     /// <summary>
     /// Begins recording commands into this command buffer
     /// </summary>
-    void Begin();
+    void Begin(ICommandAllocator allocator);
 
     /// <summary>
     /// Ends recording commands and prepares for submission