P6: custom emoji, fuller remote profiles, and polls both ways

- Custom emoji (Emoji tags) on posts, display names, bios and profile fields, at most 64 per object, proxied, in
  Status.emojis and Account.emojis.
- Remote profiles keep their header, profile fields, locked flag, published date, movedTo, indexable, memorial and
  image descriptions (a locked GoToSocial account no longer shows as open).
- Polls: incoming Questions (Mastodon, Misskey, Pleroma, GoToSocial shapes) with counts, voters, end and closed;
  our own polls from the Mastodon API go out as Questions; votes in are counted once per voter and never become
  replies; personas vote on other servers' polls with one Note per choice; counts refresh with an Update at most every
  three minutes; a poll closes on time and tells its voters and its author. GET /api/v1/polls/:id and POST
  /api/v1/polls/:id/votes.
- An Update without a newer `updated` only refreshes poll, video, audio and event details and leaves no revision.

Checked live against GoToSocial: each side's poll reaches the other as a poll and each side's vote is counted.

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

PrivaPub/Models/User/Avatar.cs

@@ -59,6 +59,13 @@ namespace PrivaPub.Models.User
 		public string PersonalNote { get; set; }
 		public string ModerationNote { get; set; }
 		public bool IsDiscoverable { get; set; } = true;
+		public bool IsIndexable { get; set; }
+		public bool IsLocked { get; set; }//manuallyApprovesFollowers
+		public bool IsMemorial { get; set; }
+		public List<PrivaPub.Models.Post.CustomEmoji> Emojis { get; set; } = new();
+		public string PictureDescription { get; set; }
+		public string HeaderDescription { get; set; }
+		public DateTime? Published { get; set; }//the actor's own published
 
 		public string ActorURI { get; set; }//id
 		public string PublicKeyId { get; set; }