P7: Lemmy's Warn and Resolve{Flag}

- A Warn from a community's moderator about a persona's own post there becomes that persona's moderation_warning
  notification (Mastodon's AccountWarning, with the reason and the post), believed from the community's own server or
  from an account the community's moderators collection lists. Remote communities keep that collection's address
  (attributedTo) as ForeignAvatar.ModeratorsURL; it is read only when a warning needs it.
- A Resolve{Flag} for one of our reports (`/grunts/flag-<report id>`) is kept as the report's remote resolution when it
  comes from the server holding what was reported, or the community it was reported to; our own moderators'
  resolution is never replaced. The moderators' report list shows both.

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

PrivaPub/Models/Social/Notification.cs

@@ -12,6 +12,7 @@ namespace PrivaPub.Models.Social
 		public string DedupeKey { get; set; }
 		public string Emoji { get; set; }//a reaction's emoji
 		public string EmojiURL { get; set; }
+		public string Text { get; set; }//a moderation warning's reason
 		public bool IsRead { get; set; }
 		public bool Filtered { get; set; }//held back by the persona's notification policy, in a NotificationRequest
 		public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
@@ -27,6 +28,7 @@ namespace PrivaPub.Models.Social
 		Update,
 		Poll,
 		Reaction,
-		Quote
+		Quote,
+		ModerationWarning
 	}
 }