feat(rhi)!: refactor resource handles to GPUTexture/GPUBuffer

Refactored all graphics resource handles to use Handle<GPUTexture> and Handle<GPUBuffer> instead of Handle<Texture> and Handle<GraphicsBuffer>. Updated all APIs, interfaces, and implementations to use the new types, including ICommandBuffer, IResourceAllocator, ISwapChain, IRenderOutput, IRenderGraphBuilder, and related classes. Introduced TempJobAllocator for frame-latency-aware allocations. Updated ResourceHandleExtensions for new conversions. Performed minor code cleanups and removed the empty ClusterLod.cs file.

BREAKING CHANGE: All usages of Handle<Texture> and Handle<GraphicsBuffer> are replaced with Handle<GPUTexture> and Handle<GPUBuffer>. This affects all APIs and resource management code. Callers must update their code to use the new handle types.

src/Runtime/Ghost.Graphics/test.gshdr

@@ -109,14 +109,12 @@ shader "MyShader/Standard"
                 // float4 blendedColor = (color1 + color2 + color3 + color4) * 0.25f;
                 // return perMaterialData.color * blendedColor + input.color;
 
-                // TODO: Randome color on meshlet.
-                // return 1.0;
                 uint hash = PCGHash(input.meshletID);
-                
+
                 float r = float((hash & 0xFF0000u) >> 16) / 255.0;
                 float g = float((hash & 0x00FF00u) >> 8)  / 255.0;
                 float b = float((hash & 0x0000FFu))       / 255.0;
-                
+
                 return float4(r, g, b, 1.0);
             }
         }