Refactor asset handler system and catalog for safety

- Introduced AssetHandlerInfo struct for handler registration and lookup, enabling handler caching and decoupling instantiation from extension/type.
- Changed CustomAssetHandlerAttribute to use required named properties; updated source generator.
- Replaced HandlerTypeId with AssetTypeId throughout metadata, catalog, and sub-asset records for clarity.
- Refactored asset catalog to use connection pooling and local command creation for thread safety.
- Updated asset handler interfaces and implementations to align with new registration system and removed redundant properties.
- Migrated mesh import and meshlet building to async JobScheduler jobs; switched to TLSF allocator and improved safety checks.
- Made meshlet/LOD hierarchy building async and job-based with better memory management.
- Updated usages and tests for new APIs; refreshed project references and package versions.
- Improved documentation and code comments for clarity.

src/Runtime/Ghost.Generator/ShaderPropertiesGenerator.cs

@@ -176,6 +176,7 @@ namespace {info.TypeSymbol.ContainingNamespace.ToDisplayString()}
     [global::System.Runtime.InteropServices.StructLayout(global::System.Runtime.InteropServices.LayoutKind.Sequential, Pack = 4)]
     {info.TypeSymbol.DeclaredAccessibility.ToString().ToLower()} partial struct {info.TypeSymbol.Name}
     {{
+#if DEBUG || GHOST_EDITOR
         public const string HLSL_SOURCE = @""
 # ifndef {definedSymbol}
 # define {definedSymbol}
@@ -185,13 +186,14 @@ struct {info.Name}
 }};
 # endif // {definedSymbol}"";
     }}
+#endif
 }}";
 
                 context.AddSource($"{info.TypeSymbol.Name}_HLSL.gen.cs", code);
                 codeBuilder.Clear();
 
                 var typeFullName = info.TypeSymbol.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat);
-                registerBuilder.AppendLine($@"        global::Ghost.DSL.ShaderPropertiesRegistry.Register(""{info.ShaderName}"", {typeFullName}.HLSL_SOURCE, (uint)sizeof({typeFullName}));");
+                registerBuilder.AppendLine($@"        global::Ghost.Core.Graphics.ShaderPropertiesRegistry.Register(""{info.ShaderName}"", {typeFullName}.HLSL_SOURCE, (uint)sizeof({typeFullName}));");
             }
 
             var registerTypeName = "g_shaderproperty_registeration";