[store] Refactor service registration mechanism.

modules/ContentStore/ContentStore.cs

@@ -1,20 +1,32 @@
-using Kruzya.TelegramBot.Core;
+using System.Reflection;
+using Kruzya.TelegramBot.Core;
 using Microsoft.Extensions.DependencyInjection;
 using West.TelegramBot.ContentStore.Service;
+using Module = Kruzya.TelegramBot.Core.Module;
 
 namespace West.TelegramBot.ContentStore;
 
 public class ContentStore : Module
 {
+    private readonly List<Type> _mediaServiceTypes = new();
+    
     public ContentStore(Core core) : base(core)
     {
+        foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
+        {
+            foreach (var exportedType in assembly.GetExportedTypes()
+                         .Where(t => !t.IsAbstract && t.IsSubclassOf(typeof(IRandomMediaService))))
+            {
+                _mediaServiceTypes.Add(exportedType);
+            }
+        }
     }
 
     public override void ConfigureServices(IServiceCollection services)
     {
-        services.AddSingleton<OBoobsService>();
-        services.AddSingleton<CatApiService>();
-        services.AddSingleton<DogApiService>();
-        services.AddSingleton<AnimBoobsService>();
+        foreach (var serviceType in _mediaServiceTypes)
+        {
+            services.AddSingleton(serviceType);
+        }
     }
 }