refactor: fix MappingConfig to avoid invalid property access and restore using directives

src/NexusReader.Application/Mappings/MappingConfig.cs

@@ -1,22 +1,20 @@
 using Mapster;
-using MapsterMapper;
+using NexusReader.Application.DTOs.User;
+using NexusReader.Domain.Entities;
 using Microsoft.Extensions.DependencyInjection;
-using System.Reflection;
 
 namespace NexusReader.Application.Mappings;
 
 public static class MappingConfig
 {
-    public static IServiceCollection AddMapsterConfiguration(this IServiceCollection services)
+    public static void RegisterMappings(this IServiceCollection services)
     {
         var config = TypeAdapterConfig.GlobalSettings;
         
-        // Manual registration for AOT (or use Source Generator)
+        config.NewConfig<NexusUser, UserProfileDto>();
-        // config.NewConfig<Source, Destination>();
+            // Roles are mapped manually in queries due to Identity structure
 
         services.AddSingleton(config);
         services.AddScoped<IMapper, ServiceMapper>();
-
-        return services;
     }
 }