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/Contracts/IShaderCompiler.cs

@@ -36,7 +36,7 @@ public struct GraphicsCompiledResult : IDisposable
 public ref struct ShaderCompilationConfig
 {
     public ReadOnlySpan<string> defines;
-    public string? include;
+    public ReadOnlySpan<string> includes;
     public string shaderPath;
     public string entryPoint;
     public ShaderStage stage;
@@ -144,6 +144,6 @@ public readonly struct ShaderReflectionData
 public interface IShaderCompiler : IDisposable
 {
     Result<ShaderCompileResult> Compile(ref readonly ShaderCompilationConfig config, Allocator allocator);
-    Result<GraphicsCompiledResult> CompilePass(IPassDescriptor descriptor, ref readonly ShaderCompilationConfig additionalConfig, string? generatedCodePath);
-    Result<GraphicsCompiledResult, ErrorStatus> LoadCompiledCache(ShaderPassKey key);
+    Result<GraphicsCompiledResult> CompilePass(IPassDescriptor descriptor, ref readonly ShaderCompilationConfig additionalConfig, Key64<ShaderVariant> key);
+    Result<GraphicsCompiledResult, ErrorStatus> LoadCompiledCache(Key64<ShaderVariant> key);
 }