feat(core,rendering)!: add cleanup component support, refactor render pipeline

Introduce ICleanupComponent and cleanup archetype logic in ECS. Refactor component versioning to uint. Update IResourceDatabase to use map/unmap pattern. Decouple per-frame render requests from RenderSystem via IRenderPayload. Update render pipeline and extraction system to new API.

BREAKING CHANGE: Entity destruction and render pipeline APIs have changed. IResourceDatabase.MapResource signature is updated; all callers must use map/memcpy/unmap. RenderSystem no longer manages per-frame render requests directly.

src/Runtime/Ghost.Engine/Components/GPUInstanceRef.cs

@@ -0,0 +1,8 @@
+using Ghost.Entities;
+
+namespace Ghost.Engine.Components;
+
+public struct GPUInstanceRef : IComponent
+{
+    public uint gpuSceneIndex;
+}

src/Runtime/Ghost.Engine/Components/MeshInstance.cs

@@ -11,4 +11,4 @@ public struct MeshInstance : IComponent
     public RenderingLayerMask renderingLayerMask;
     public ShadowCastingMode shadowCastingMode;
     public bool staticShadowCaster;
-}
+}