Add sub-asset import and mesh asset support

- Implement sub-asset import for mesh/model assets with manifest generation and deterministic GUIDs
- Extend AssetCatalog for sub-asset tracking and management
- Update AssetRegistry and ImportCoordinator for sub-asset workflows
- Add mesh asset parsing, GPU upload, and resource management
- Update mesh data structures for meshlet groups/hierarchy and LODs
- Improve tests for sub-asset import and mesh handling
- Enhance mocks for mesh asset testing and resource mapping
- Fix path handling and native DLL loading issues
- Miscellaneous bug fixes and refactoring

src/Runtime/Ghost.Graphics/Shaders/Includes/Properties.hlsl

@@ -61,6 +61,10 @@ struct MeshData
     BYTE_ADDRESS_BUFFER meshletBuffer;
     BYTE_ADDRESS_BUFFER meshletVerticesBuffer;
     BYTE_ADDRESS_BUFFER meshletTrianglesBuffer;
+    BYTE_ADDRESS_BUFFER meshletGroupBuffer;
+    BYTE_ADDRESS_BUFFER meshletHierarchyBuffer;
+    uint meshletCount;
+    uint lodLevelCount;
     uint materialSlotCount;
 };