feat(nativegen)!: refactor to struct-based native wrappers

Major overhaul of native wrapper generation for ufbx and nvtt.
Replaces all hand-written and class-based wrappers with auto-generated partial struct wrappers that directly expose native API methods via pointers. Introduces a new JSON-driven configuration system using "remaps" and "actions" for flexible parameter/return mapping and method routing. Removes legacy config sections and helper classes, focusing solely on method wrappers. Updates all usages and tests to use the new pointer-based API. Cleans up obsolete code and ensures resource management is handled via struct Dispose methods. The result is a thinner, more direct, and maintainable interop layer.

BREAKING CHANGE: All managed wrapper classes and helpers are removed in favor of struct-based pointer wrappers. API usage and resource management patterns have changed.

src/Runtime/Ghost.Core/Ghost.Core.csproj

@@ -22,12 +22,12 @@
   <ItemGroup>
     <PackageReference Include="Misaki.HighPerformance" Version="1.0.4" />
     <PackageReference Include="Misaki.HighPerformance.Jobs" Version="1.5.1" />
-    <PackageReference Include="Misaki.HighPerformance.LowLevel" Version="1.4.3">
+    <PackageReference Include="Misaki.HighPerformance.LowLevel" Version="1.4.4">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
     <PackageReference Include="Misaki.HighPerformance.Mathematics" Version="1.3.1" />
-    <PackageReference Include="System.IO.Hashing" Version="10.0.3" />
+    <PackageReference Include="System.IO.Hashing" Version="10.0.5" />
     <PackageReference Include="TerraFX.Interop.Windows" Version="10.0.26100.6" />
   </ItemGroup>