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/ActivationHandler.cs

@@ -66,13 +66,13 @@ internal static class ActivationHandler
 
         AllocationManager.Initialize(opts);
 
-        var assetRegistry = App.GetService<IAssetRegistry>();
-        var engineCore = App.GetService<EngineCore>();
+        //var assetRegistry = App.GetService<IAssetRegistry>();
+        //var engineCore = App.GetService<EngineCore>();
 
-        assetRegistry.OnAssetImported += (sender, e) =>
-        {
-            engineCore.AssetManager.ReimportAsset(e);
-        };
+        //assetRegistry.OnAssetImported += (sender, e) =>
+        //{
+        //    engineCore.AssetManager.ReimportAsset(e);
+        //};
 
         return ValueTask.CompletedTask;
     }