The inbox answers once it has verified, and processes from the job queue

InboxService is split the way the roadmap lays out Federation/Inbox:
- InboxReceiver reads and verifies the request exactly as before, runs
  the checks that need no fetch (the activity id's origin, a Follow of a
  missing or local-only actor, an Undo of someone else's activity, an
  embedded object attributed to someone else), queues a ProcessInbox job
  and answers 202. The job's dedupe key is the activity id, so a peer that
  delivers the same activity twice is processed once.
- InboxProcessor (two at a time, eight attempts) loads the verified actor
  and hands the activity to the handler for its type.
- Handlers/{Follow,Undo,Create,Delete,Update}Handler are the old methods,
  unchanged except that they no longer produce status codes; the JSON
  helpers live in Objects/ActivityJson and the group membership helpers in
  Inbox/ForeignMembers.

A slow fetch of an object or a remote actor now delays the job, not the
sender's HTTP request.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012CzABvBkbcFqoHdmi8b9WB

PrivaPub/Middleware/SocialPubConfigurations.cs

@@ -14,6 +14,7 @@ using PrivaPub.Services.ClientToServer.Public;
 using PrivaPub.Federation.Actors;
 using PrivaPub.Federation.Outbox;
 using PrivaPub.Federation.Inbox;
+using PrivaPub.Federation.Inbox.Handlers;
 using PrivaPub.Infrastructure.Http;
 using PrivaPub.Infrastructure.Jobs;
 using Microsoft.Extensions.Options;
@@ -51,7 +52,13 @@ namespace PrivaPub.Middleware
 				.AddSingleton<ILocalActorService, LocalActorService>()
 				.AddSingleton<IRemoteActorService, RemoteActorService>()
 				.AddSingleton<IDeliveryService, DeliveryService>()
-				.AddTransient<IInboxService, InboxService>()
+				.AddSingleton<IInboxReceiver, InboxReceiver>()
+				.AddSingleton<IActivityHandler, FollowHandler>()
+				.AddSingleton<IActivityHandler, UndoHandler>()
+				.AddSingleton<IActivityHandler, CreateHandler>()
+				.AddSingleton<IActivityHandler, DeleteHandler>()
+				.AddSingleton<IActivityHandler, UpdateHandler>()
+				.AddSingleton<IJobHandler, InboxProcessor>()
 				.AddSingleton<IJobQueue, JobQueue>()
 				.AddSingleton<IHostCircuitBreaker, HostCircuitBreaker>()
 				.AddSingleton<IJobHandler, DeliveryJobHandler>()