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/Federation/Inbox/RemoteEdits.cs

@@ -1,4 +1,4 @@
-using MongoDB.Entities;
+using MongoDB.Entities;
 
 using PrivaPub.Domain.Statuses;
 using PrivaPub.Federation.Actors;
@@ -33,6 +33,7 @@ namespace PrivaPub.Federation.Inbox
 			post.Video = note.Video ?? post.Video;
 			post.Audio = note.Audio ?? post.Audio;
 			post.Event = note.Event ?? post.Event;
+			post.Place = note.Place;
 			if (!IsEdit(note, post))
 			{
 				await DB.Default.SaveAsync(post, token);