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.

GhostEngine.slnx

@@ -38,5 +38,5 @@
     <Project Path="Ghost.Shader.Test/Ghost.Shader.Test.csproj" />
     <Project Path="Ghost.Test.Core/Ghost.Test.Core.csproj" />
   </Folder>
-  <Project Path="Ghost.Shader/Ghost.SDL.csproj" />
+  <Project Path="Ghost.DSL/Ghost.DSL.csproj" />
 </Solution>