feat(transport): DependencyResolver with topological closure

src/ScadaLink.Transport/ServiceCollectionExtensions.cs

@@ -1,5 +1,6 @@
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Options;
+using ScadaLink.Transport.Export;
 
 namespace ScadaLink.Transport;
 
@@ -11,7 +12,8 @@ public static class ServiceCollectionExtensions
     {
         ArgumentNullException.ThrowIfNull(services);
         services.AddOptions<TransportOptions>().BindConfiguration(OptionsSection);
-        // Concrete services added in later tasks.
+        services.AddScoped<DependencyResolver>();
+        // Remaining concrete services added in later tasks.
         return services;
     }
 }