case 4690 - Swashbuckle 10.3.1 / OpenAPI.NET 2: namespace and security requirement changes; drop explicit Microsoft.OpenApi

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/AyaNova/ConfigureSwaggerOptions.cs

@@ -3,7 +3,7 @@ namespace AyaNova
     using Asp.Versioning.ApiExplorer;
     using Microsoft.Extensions.DependencyInjection;
     using Microsoft.Extensions.Options;
-    using Microsoft.OpenApi.Models;
+    using Microsoft.OpenApi;
     using Swashbuckle.AspNetCore.SwaggerGen;
     using System;