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/Domain/Statuses/StatusService.cs

@@ -39,6 +39,7 @@ namespace PrivaPub.Domain.Statuses
 		public double? Latitude { get; init; }
 		public double? Longitude { get; init; }
 		public double? RangeKm { get; init; }
+		public PollDraft Poll { get; init; }
 	}
 
 	public sealed record StatusOutcome(PostEntity Post, int Status = StatusCodes.Status200OK, string Error = default)
@@ -69,10 +70,12 @@ namespace PrivaPub.Domain.Statuses
 		readonly IFanout _fanout;
 		readonly IMediaService _media;
 		readonly IGroupDistributor _groups;
+		readonly IPollService _polls;
 
 		public StatusService(DbEntities dbEntities, ILocalActorService localActors, IRemoteActorService remoteActors, IDeliveryService delivery,
-			IContentRenderer content, IOutboxPublisher outbox, IFanout fanout, IMediaService media, IGroupDistributor groups)
+			IContentRenderer content, IOutboxPublisher outbox, IFanout fanout, IMediaService media, IGroupDistributor groups, IPollService polls)
 		{
+			_polls = polls;
 			_media = media;
 			_groups = groups;
 			_dbEntities = dbEntities;
@@ -89,8 +92,10 @@ namespace PrivaPub.Domain.Statuses
 			var media = await Media(author, draft.MediaIds, default, token);
 			if (media == default)
 				return StatusOutcome.Fail(StatusCodes.Status422UnprocessableEntity, "Validation failed: Media attachments are invalid");
-			if (string.IsNullOrWhiteSpace(draft.Text) && media.Count == 0)
+			if (string.IsNullOrWhiteSpace(draft.Text) && media.Count == 0 && draft.Poll == default)
 				return StatusOutcome.Fail(StatusCodes.Status422UnprocessableEntity, "Validation failed: Text can't be blank");
+			if (draft.Poll != default && _polls.Invalid(draft.Poll) is { } invalidPoll)
+				return StatusOutcome.Fail(StatusCodes.Status422UnprocessableEntity, invalidPoll);
 
 			LocalActor group = default;
 			if (!string.IsNullOrEmpty(draft.GroupId))
@@ -157,7 +162,8 @@ namespace PrivaPub.Domain.Statuses
 				InReplyToURI = parent?.ObjectURI ?? (IsRemoteUri(draft.InReplyTo) ? draft.InReplyTo : default),
 				InReplyToAccountId = parent?.AuthorAccountId ?? parent?.GroupUserId,
 				IsLocalOnly = isLocalOnly,
-				ActorURI = author.Uri
+				ActorURI = author.Uri,
+				Poll = draft.Poll == default ? default : _polls.Create(draft.Poll)
 			};
 			post.ID = (string)post.GenerateNewID();
 			post.ObjectURI = author.PostUri(post.ID);
@@ -200,6 +206,7 @@ namespace PrivaPub.Domain.Statuses
 			if (parent != default)
 				await DB.Default.Update<PostEntity>().MatchID(parent.ID).Modify(b => b.Inc(p => p.RepliesCount, 1)).ExecuteAsync(token);
 			await _fanout.Distribute(post, token);
+			await _polls.Scheduled(post, token);
 			if (create != default)
 				await _outbox.Publish(author, post, create, token);
 			if (create != default && group is { IsCircle: false } && visibility is PostVisibility.Public or PostVisibility.Unlisted)