Blocks, mutes, bookmarks, pins and reports

- Blocks are per persona and never federate (a Block activity would tell
  the other server who blocked whom): the blocked account is removed as a
  follower, with a Reject{Follow} if it is remote, unfollowed, cleared from
  home and notifications, and refused with Reject if it follows again.
- Mutes (optionally timed, optionally sparing notifications) and per-
  persona domain blocks keep authors out of home timelines, notifications
  and every status list the API returns; the boosts of a hidden author's
  posts are hidden too.
- Bookmarks and pins (at most five, public or unlisted, own posts) with
  their Mastodon endpoints and flags; pinned posts are the actor's
  `featured` collection at /trophies, and `featuredTags` points at
  /tattoos.
- Reports: /api/v1/reports stores the report and, when forwarding to a
  remote account, sends Flag from the instance actor, so the reporting
  persona is never named to the other server. An inbound Flag about a local
  persona or its posts becomes a report; moderators list and resolve them
  under /clientapi/moderator/reports.

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

PrivaPub/Federation/Inbox/Handlers/FollowHandler.cs

@@ -46,6 +46,20 @@ namespace PrivaPub.Federation.Inbox.Handlers
 			var target = await _localActors.FindByUri(Id(follow["object"]), token);
 			if (target is not { IsFederated: true } || target.Kind == LocalActorKind.Application)
 				return;
+			if (target.Kind == LocalActorKind.Person
+				&& await DB.Default.Find<Models.Social.Block>().Match(b => b.AvatarId == target.Id && b.TargetActorURI == follower.ActorURI).ExecuteAnyAsync(token))
+			{
+				var reject = new JsonObject
+				{
+					["@context"] = ActivityPubRenderer.ActivityStreams,
+					["id"] = target.ActivityUri($"reject-{Guid.NewGuid():N}"),
+					["type"] = "Reject",
+					["actor"] = target.Uri,
+					["object"] = follow.DeepClone()
+				};
+				await _delivery.Enqueue(target, new[] { follower.InboxURL }, reject, token);
+				return;
+			}
 
 			var existing = await _dbEntities.Followers
 				.Match(f => f.LocalActorId == target.Id && f.LocalActorKind == target.Kind && f.ActorURI == follower.ActorURI)