Remove unused namespaces

Author: localden

src/ModelContextProtocol.AspNetCore/Auth/McpAuthorizationExtensions.cs

@@ -1,5 +1,4 @@
 using Microsoft.AspNetCore.Authentication;
-using Microsoft.Extensions.DependencyInjection.Extensions;
 using ModelContextProtocol.AspNetCore.Auth;
 
 namespace Microsoft.Extensions.DependencyInjection;

src/ModelContextProtocol.AspNetCore/McpEndpointRouteBuilderExtensions.cs

@@ -2,9 +2,7 @@
 using Microsoft.AspNetCore.Http.Metadata;
 using Microsoft.AspNetCore.Routing;
 using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Options;
 using ModelContextProtocol.AspNetCore;
-using ModelContextProtocol.AspNetCore.Auth;
 using ModelContextProtocol.Protocol.Messages;
 using System.Diagnostics.CodeAnalysis;