Refactor DI: move repository registrations to Infrastructure

Centralize repository service registrations in Infrastructure's
DependencyInjection.cs for better maintainability and separation
of concerns. Remove direct registrations from Program.cs and
add necessary using statements.

DbFirst.Infrastructure/DependencyInjection.cs

@@ -1,3 +1,5 @@
+using DbFirst.Application.Repositories;
+using DbFirst.Infrastructure.Repositories;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
@@ -15,6 +17,10 @@ public static class DependencyInjection
         services.AddDbContext<MassDataDbContext>(options =>
             options.UseSqlServer(configuration.GetConnectionString("MassDataConnection")));
 
+        services.AddScoped<ICatalogRepository, CatalogRepository>();
+        services.AddScoped<IMassDataRepository, MassDataRepository>();
+        services.AddScoped<ILayoutRepository, LayoutRepository>();
+
         return services;
     }
 }