Forum import: archived comments posted under their original author names

One account per original author (nickname = name as signed on the old
site, group 'Original site'), display-name driver 'museum' keeps the
brackets; --replace re-imports threads without real replies.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YDRjtmAiNpo5mK5N3d7QwZ

forum/extension/extend.php

@@ -2,10 +2,14 @@
 
 use Flarum\Extend;
 use Oc\Museum\Console\ImportCommand;
+use Oc\Museum\DisplayName;
 
 return [
     (new Extend\Console())->command(ImportCommand::class),
 
+    // selected by oc:import (setting display_name_driver = museum); needs the Nicknames extension
+    (new Extend\User())->displayNameDriver('museum', DisplayName::class),
+
     // threads shown inside the museum pages (flarum/embed) take the look of the static site
     (new Extend\Frontend('embed'))->css(__DIR__.'/less/embed.less'),
 ];