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.Entities/System.cs

@@ -8,15 +8,15 @@ public readonly ref struct SystemAPI
     {
         get; init;
     }
+
+    public World World
+    {
+        get; init;
+    }
 }
 
 public interface ISystem
 {
-    World World
-    {
-        get; init;
-    }
-
     void Initialize(ref readonly SystemAPI systemAPI);
     void Update(ref readonly SystemAPI systemAPI);
     void Cleanup(ref readonly SystemAPI systemAPI);
@@ -277,11 +277,7 @@ public abstract class SystemGroup : ISystem
     public void AddSystem<T>()
         where T : ISystem, new()
     {
-        _systems.Add(new T()
-        {
-            World = World
-        });
-
+        _systems.Add(new T());
         _version++;
     }
 
@@ -342,9 +338,7 @@ public abstract class SystemGroup : ISystem
     }
 }
 
-public class DefaultSystemGroup : SystemGroup
-{
-}
+public class DefaultSystemGroup : SystemGroup;
 
 public class SystemManager
 {
@@ -363,10 +357,7 @@ public class SystemManager
     public void AddSystem<T>()
         where T : ISystem, new()
     {
-        _systems.Add(new T()
-        {
-            World = _world
-        });
+        _systems.Add(new T());
     }
 
     public T GetSystem<T>()
@@ -383,24 +374,42 @@ public class SystemManager
         throw new InvalidOperationException($"System of type {typeof(T).FullName} not found in SystemManager.");
     }
 
-    internal void InitializeAll(ref readonly SystemAPI systemAPI)
+    internal void InitializeAll(TimeData timeData)
     {
+        var systemAPI = new SystemAPI
+        {
+            Time = timeData,
+            World = _world
+        };
+
         foreach (var system in _systems)
         {
             system.Initialize(in systemAPI);
         }
     }
 
-    internal void UpdateAll(ref readonly SystemAPI systemAPI)
+    internal void UpdateAll(TimeData timeData)
     {
+        var systemAPI = new SystemAPI
+        {
+            Time = timeData,
+            World = _world
+        };
+
         foreach (var system in _systems)
         {
             system.Update(in systemAPI);
         }
     }
 
-    internal void CleanupAll(ref readonly SystemAPI systemAPI)
+    internal void CleanupAll(TimeData timeData)
     {
+        var systemAPI = new SystemAPI
+        {
+            Time = timeData,
+            World = _world
+        };
+
         foreach (var system in _systems)
         {
             system.Cleanup(in systemAPI);