P5: remote objects are read in every shape, and videos, events, audio and links keep their own details

- ObjectShapes reads `url`, `icon` and `image` as a value, a Link or an array; Markdown `content` (PeerTube) is
  rendered; a missing `mediaType` is inferred from the extension or the attachment type (Bridgy); alt text comes from
  `name`, `summary` or their language maps; thumbnails come from attachment `icon`, object `icon[]`, `image` or a Loops
  `preview`; durations are ISO 8601 or seconds; per-attachment `sensitive` is kept; the language falls back to
  `@context` `@language` (Pleroma); titles and excerpts are plain text; hashtags normalise with NFKC like Mastodon.
- Typed details on Post: Link (Lemmy link posts, Mbin `source` URLs, Mastodon 4.7 Link attachments with an FEP-8967
  publisher preview), Video (PeerTube files with their streams, HLS playlist, poster, captions, chapters, licence,
  channel, live state, comment policy), Audio (Funkwhale), Event (Mobilizon, Gancio, Hubzilla: times, zone, floating
  time, places and addresses, online link, capacity, status), the cover image, and the author's own source text.
- Mastodon API: a card built from those details without fetching anything, an event's "when · where" line, attachment
  thumbnails and durations, and no media file offered as a preview image.

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

PrivaPub/Models/Post/PostDetails.cs

@@ -0,0 +1,86 @@
+namespace PrivaPub.Models.Post
+{
+	public class PostSource
+	{
+		public string Content { get; set; }
+		public string MediaType { get; set; }//text/markdown, text/x.misskeymarkdown (MFM), text/bbcode…
+	}
+
+	public class PostLink
+	{
+		public string Href { get; set; }
+		public string MediaType { get; set; }
+		public string Title { get; set; }
+		public string Description { get; set; }
+		public string ImageURL { get; set; }
+		public bool FromPublisher { get; set; }//title, description and image came with the post (FEP-8967 preview), nothing was fetched
+	}
+
+	public class MediaVariant
+	{
+		public string Url { get; set; }
+		public string MediaType { get; set; }
+		public int? Width { get; set; }
+		public int? Height { get; set; }
+		public double? Fps { get; set; }
+		public long? Size { get; set; }
+		public List<string> Streams { get; set; } = new();//"audio", "video", from PeerTube's ffprobe_codec_type
+	}
+
+	public class VideoDetails
+	{
+		public double? DurationSeconds { get; set; }
+		public List<MediaVariant> Variants { get; set; } = new();
+		public string PlaylistURL { get; set; }//HLS
+		public bool IsLive { get; set; }
+		public int? State { get; set; }//PeerTube: 1 published, 4 waiting for live, 5 live ended
+		public long? Views { get; set; }
+		public int? CommentsPolicy { get; set; }//PeerTube: 1 open, 2 closed, 3 needs approval
+		public bool? DownloadEnabled { get; set; }
+		public string Licence { get; set; }
+		public string Category { get; set; }
+		public string ChannelURI { get; set; }
+		public string EmbedURL { get; set; }
+		public string ChaptersURL { get; set; }
+		public List<Caption> Captions { get; set; } = new();
+	}
+
+	public class Caption
+	{
+		public string Language { get; set; }
+		public string Url { get; set; }
+	}
+
+	public class AudioDetails
+	{
+		public double? DurationSeconds { get; set; }
+		public List<MediaVariant> Variants { get; set; } = new();
+		public string Album { get; set; }
+		public int? Position { get; set; }
+		public string Licence { get; set; }
+	}
+
+	public class EventDetails
+	{
+		public DateTime? Start { get; set; }
+		public DateTime? End { get; set; }
+		public string TimeZone { get; set; }
+		public bool FloatingTime { get; set; }//"-00:00": a local time with no zone (Hubzilla)
+		public List<EventPlace> Places { get; set; } = new();
+		public string OnlineURL { get; set; }
+		public string JoinMode { get; set; }
+		public int? ParticipantCount { get; set; }
+		public int? Capacity { get; set; }
+		public string Status { get; set; }
+		public string Category { get; set; }
+	}
+
+	public class EventPlace
+	{
+		public string Name { get; set; }
+		public string Address { get; set; }
+		public double? Latitude { get; set; }
+		public double? Longitude { get; set; }
+		public string Url { get; set; }//a VirtualLocation
+	}
+}