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/Models/Social/Relationships.cs

@@ -0,0 +1,60 @@
+using MongoDB.Entities;
+
+namespace PrivaPub.Models.Social
+{
+	public class Block : Entity
+	{
+		public string AvatarId { get; set; }
+		public string TargetAccountId { get; set; }
+		public string TargetActorURI { get; set; }
+		public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+	}
+
+	public class Mute : Entity
+	{
+		public string AvatarId { get; set; }
+		public string TargetAccountId { get; set; }
+		public string TargetActorURI { get; set; }
+		public bool HideNotifications { get; set; } = true;
+		public DateTime? ExpiresAt { get; set; }
+		public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+	}
+
+	public class AccountDomainBlock : Entity
+	{
+		public string AvatarId { get; set; }
+		public string Domain { get; set; }
+		public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+	}
+
+	public class Bookmark : Entity
+	{
+		public string AvatarId { get; set; }
+		public string PostId { get; set; }
+		public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+	}
+
+	public class Pin : Entity
+	{
+		public string AvatarId { get; set; }
+		public string PostId { get; set; }
+		public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+	}
+
+	public class Report : Entity
+	{
+		public string ReporterAvatarId { get; set; }
+		public string ReporterActorURI { get; set; }
+		public string TargetAccountId { get; set; }
+		public string TargetActorURI { get; set; }
+		public List<string> PostIds { get; set; } = new();
+		public List<string> ObjectURIs { get; set; } = new();
+		public string Category { get; set; } = "other";
+		public string Comment { get; set; }
+		public bool Forwarded { get; set; }
+		public bool IsResolved { get; set; }
+		public string ResolvedBy { get; set; }
+		public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+		public DateTime? ResolvedAt { get; set; }
+	}
+}