Add Ghost.Nvtt C# wrapper and integrate nvtt texture pipeline

- Introduce full managed C# wrapper for NVIDIA Texture Tools (nvtt) with safe handle classes, idiomatic APIs, and managed callback support.
- Integrate Ghost.Nvtt into Ghost.Editor.Core and Ghost.MicroTest; update TextureAssetHandler to use the new nvtt wrapper for texture compression.
- Add comprehensive end-to-end binding test (NvttBindingTest).
- Refactor D3D12 resource management: add deferred/immediate release APIs, update allocator/database usage, and ensure proper resource cleanup.
- Update project files for new native DLL layout and dependency versions.
- Minor API cleanups: EditorApplication properties, D3D12 input layout, and removal of obsolete code.
- Update shaders, tests, and documentation for new APIs and usage patterns.

src/Test/Ghost.Graphics.Test/UnitTestApp.xaml.cs

@@ -2,7 +2,6 @@ using Ghost.Core;
 using Ghost.Graphics.Test.Windows;
 
 using Microsoft.UI.Xaml;
-using Microsoft.VisualStudio.TestTools.UnitTesting.AppContainer;
 using System.Runtime.InteropServices;
 
 // To learn more about WinUI, the WinUI project structure,
@@ -32,7 +31,7 @@ public partial class UnitTestApp : Application
                        OperatingSystem.IsLinux() ? "linux" :
                        OperatingSystem.IsMacOS() ? "osx" : "unknown";
         var arch = Environment.Is64BitProcess ? "x64" : "x86";
-        var nativeDllDir = Path.Combine(currentDir, "runtime", platform + "-" + arch, "native");
+        var nativeDllDir = Path.Combine(currentDir, "runtimes", platform + "-" + arch, "native");
         if (Directory.Exists(nativeDllDir))
         {
             foreach (var dll in Directory.EnumerateFiles(nativeDllDir, "*.dll"))