Refactor asset pipeline to use file paths, improve import

- Switched asset handler interfaces and implementations to use file paths instead of FileStreams for all operations.
- Refactored mesh asset structure and parsing, moved meshlet logic to MeshProcessor, and introduced hierarchical MeshNode types.
- Updated texture asset handling: switched to bits-per-channel, improved mipmap/cubemap generation, and SPMD HDRI support.
- Updated shader asset handlers to use file paths and split code compilation logic.
- Improved asset registry: added event debouncing, better path handling, and import time/hash tracking.
- Added source generator for IAssetSettings registration to support polymorphic JSON serialization.
- Updated dependencies and tests; various minor fixes and cleanups.

src/Editor/Ghost.Editor/Models/ExplorerItem.cs

@@ -43,7 +43,7 @@ internal partial class ExplorerItem : ObservableObject
     public ExplorerItem(string name, string path, bool isDirectory, AssetType assetType = AssetType.Unknown)
     {
         Name = name;
-        Path = PathUtility.Normalize(path);
+        Path = path;
         IsDirectory = isDirectory;
         AssetType = assetType;