P7: community flairs, from Lemmy and PieFed

- A post's flairs are read in both dialects: Lemmy 1.0's CommunityPostTag (id, slug, name, description, colour slot)
  and PieFed's lemmy:CommunityTag (display name, text and background colours, whether to blur images). Colours are
  kept only as a colour slot or a hex value.
- A community's own list comes from its `tag` and PieFed's older `lemmy:tagsForPosts`, and fills in a post that names
  only a flair's id and slug, as Lemmy's posts do. Edits and refreshes keep them current.
- Clients get them as `privapub.flairs`.

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

PrivaPub/Models/Post/PostDetails.cs

@@ -38,6 +38,19 @@
 		public List<string> Manual { get; set; } = new();
 	}
 
+	// a community's label on a post (Lemmy 1.0's CommunityPostTag, PieFed's lemmy:CommunityTag): one of the community's own
+	public class PostFlair
+	{
+		public string Id { get; set; }
+		public string Name { get; set; }
+		public string Slug { get; set; }
+		public string Description { get; set; }
+		public string Color { get; set; }//Lemmy's colour slot, color01 to color10
+		public string TextColor { get; set; }//PieFed's, as #rrggbb
+		public string BackgroundColor { get; set; }
+		public bool BlurImages { get; set; }
+	}
+
 	public class PostSource
 	{
 		public string Content { get; set; }