Pixelfed places: a remote post's own place, shown and never federated again

A Note's `location` that is a Place with coordinates (Pixelfed sends
them as strings) is kept in the new Post.Place and shown as
Status.privapub.place {name, latitude, longitude, country}; an edit
replaces it. An Event's location stays its own `places`, and nothing
renders a place back out. Closes the INTEROP P2 Pixelfed location gap
and the ROADMAP long-tail item.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

PrivaPub/Models/Post/PostDetails.cs

@@ -1,4 +1,4 @@
-namespace PrivaPub.Models.Post
+namespace PrivaPub.Models.Post
 {
 	public class CustomEmoji
 	{
@@ -104,6 +104,15 @@ namespace PrivaPub.Models.Post
 		public string Category { get; set; }
 	}
 
+	//a remote post's own place (Pixelfed's location): shown, never federated again
+	public class PostPlace
+	{
+		public string Name { get; set; }
+		public double Latitude { get; set; }
+		public double Longitude { get; set; }
+		public string Country { get; set; }
+	}
+
 	public class EventPlace
 	{
 		public string Name { get; set; }