Render extraction system & ECS/graphics refactor

Introduced RenderExtractionSystem for entity-based render data extraction. Added MeshInstance and MeshPalette components with shadow casting support. Refactored QueryBuilder API, SharedComponentStore, and component registration for clarity and flexibility. Updated SystemManager and SystemGroup to use SystemAPI. Replaced RenderingConfig with GraphicsEngineDesc/RenderSystemDesc. RenderFrame now uses CPU/GPU fence values for sync. Removed Camera.cs in favor of ECS-based rendering. Improved Material, RenderingLayerMask, Mesh, and RenderList APIs. Updated package references and fixed naming, error handling, and disposal issues.

src/Runtime/Ghost.Engine/Systems/RenderExtractionSystem.cs

@@ -0,0 +1,62 @@
+using Ghost.Core;
+using Ghost.Engine.Components;
+using Ghost.Entities;
+using Ghost.Graphics.Core;
+using Misaki.HighPerformance.LowLevel.Buffer;
+using Misaki.HighPerformance.LowLevel.Utilities;
+
+namespace Ghost.Engine.Systems;
+
+public class RenderExtractionSystem : ISystem
+{
+    private Identifier<EntityQuery> _queryID;
+
+    public void Initialize(ref readonly SystemAPI systemAPI)
+    {
+        _queryID = new QueryBuilder()
+            // TODO: We also need to filter by MeshPalette.
+            .WithAll<MeshInstance, LocalToWorld>()
+            .Build(systemAPI.World);
+    }
+
+    public void Update(ref readonly SystemAPI systemAPI)
+    {
+        if (_queryID.IsInvalid)
+        {
+            return;
+        }
+
+        ref var query = ref systemAPI.World.ComponentManager.GetEntityQueryReference(_queryID);
+        var renderList = new RenderList(1, 64, Allocator.Temp);
+
+        // TODO: We should extract the render record for each camera because different cameras may have different culling results.
+        foreach (var chunk in query.GetChunkIterator())
+        {
+            var meshInstances = chunk.GetComponentData<MeshInstance>();
+            var localToWorlds = chunk.GetComponentData<LocalToWorld>();
+
+            for (int i = 0; i < chunk.Count; i++)
+            {
+                ref readonly var meshInstance = ref meshInstances[i];
+                ref readonly var localToWorld = ref localToWorlds[i];
+
+                renderList.Add(new RenderRecord
+                {
+                    localToWorld = localToWorld.matrix,
+                    // TODO: Get mesh and material from palette. This requires some changes to ISharedComponent since it's now fully functional right now.
+                    // mesh = meshInstance.meshIndex,
+                    // material = meshInstance.materialIndex,
+                    renderingLayerMask = meshInstance.renderingLayerMask,
+                    subMeshIndex = meshInstance.subMeshIndex,
+
+                }, 0);
+            }
+        }
+
+        // TODO: Send render list to render pipeline.
+    }
+
+    public void Cleanup(ref readonly SystemAPI systemAPI)
+    {
+    }
+}