Refactor: variant-aware shader/material pipeline overhaul

Major architectural update to graphics/material/shader system:
- Introduced strongly-typed key structs (Key64/Key128) for passes, variants, and pipelines; removed legacy key types.
- Implemented robust hashing and key generation utilities for efficient variant and pipeline lookup/caching.
- Shader compiler now compiles/caches all keyword variants using new key system; includes handled as lists.
- Switched to push constant root signature for per-draw data; updated HLSL and C# codegen accordingly.
- Refactored Material, Shader, and Pass data structures for cache efficiency and variant support.
- Pipeline library and PSO management now use 128-bit keys and variant-specific caching.
- Replaced WorldNode with SceneNode in editor/scene graph; introduced ComponentManager for archetype/query management.
- Migrated math utilities to Misaki.HighPerformance.Mathematics; updated editor controls.
- Updated all HLSL and codegen for new buffer/push constant layouts and macros.
- Misc: project reference cleanup, D3D12 Work Graph support, doc updates, and code modernization.

Ghost.Graphics/RHI/IRenderDevice.cs

@@ -9,6 +9,7 @@ public enum FeatureSupport
     MeshShaders = 1 << 2,
     SamplerFeedback = 1 << 3,
     BindlessResources = 1 << 4,
+    WorkGraphs = 1 << 5,
 }
 
 /// <summary>
@@ -40,5 +41,8 @@ public interface IRenderDevice : IDisposable
         get;
     }
 
-    public FeatureSupport GetFeatureSupport();
+    public FeatureSupport FeatureSupport
+    {
+        get;
+    }
 }