feat(bindings): update C# wrappers for meshopt, nvtt, ufbx

Refactor and regenerate native C# bindings for Ghost.MeshOptimizer, Ghost.Nvtt, and Ghost.Ufbx to match updated native APIs and improve usability.
- Replace meshoptimizer.dll with newer version.
- Move meshoptimizer functions to static methods in partial class; add new meshlet, simplification, quantization features.
- Remove enum wrappers in favor of constants; delete meshopt_Allocator.cs.
- Regenerate native wrappers with PascalCase naming, XML doc comments, and aggressive inlining.
- Implement IDisposable for resource structs; update configs for naming, documentation, and method mapping.
- Update user code to use new wrapper classes and method names.
- Improve documentation and comments for clarity.

BREAKING CHANGE: API surface changes, wrapper class and method names updated, enum wrappers removed, custom allocator deleted.

src/Tools/Ghost.NativeWrapperGen/Transform/NamingConventions.cs

@@ -63,6 +63,45 @@ public sealed class NamingConventions
             name = TrimUnderscores(name);
         }
 
+        var style = nameOpts.style as string;
+        if (!string.IsNullOrEmpty(style))
+        {
+            if (string.Equals(style, "PascalCase", StringComparison.OrdinalIgnoreCase))
+            {
+                int counter = 0;
+                Span<char> nameSpan = stackalloc char[name.Length];
+
+                for (int i = 0; i < name.Length; i++)
+                {
+                    if (i == 0)
+                    {
+                        nameSpan[counter] = char.ToUpperInvariant(name[i]);
+                        counter++;
+
+                        continue;
+                    }
+
+                    if (name[i] == '_')
+                    {
+                        while (name[i] == '_' && i < name.Length)
+                        {
+                            i++;
+                        }
+
+                        nameSpan[counter] = char.ToUpperInvariant(name[i]);
+                        counter++;
+
+                        continue;
+                    }
+
+                    nameSpan[counter] = name[i];
+                    counter++;
+                }
+
+                name = nameSpan[..counter].ToString();
+            }
+        }
+
         return name;
     }