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/RemotePosts.cs

@@ -1,4 +1,4 @@
-using MongoDB.Driver;
+using MongoDB.Driver;
 using MongoDB.Entities;
 
 using PrivaPub.Infrastructure.Http;
@@ -90,6 +90,7 @@ namespace PrivaPub.Federation.Inbox
 				Video = note.Video,
 				Audio = note.Audio,
 				Event = note.Event,
+				Place = note.Place,
 				HasContentWarning = note.Sensitive,
 				Text = note.ContentHtml,
 				ContentHtml = note.ContentHtml,