Protocol 11: sit out replaces kicking; nudge

Anyone can sit anyone out (host included); only you bring yourself back.
Out members stay in chat and the party, never block or count, and load no
media; a card with the live position and Join back (Space) replaces the
video. The mini player's x sits you out; optionally idle does too. Nudge:
the server forwards it to the target only (3/s, 20/min per sender); the
target hears the nudge sound, gets a toast and a taskbar attention
request. Kick, its messages, errors and dialog are gone.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/server/lib/src/jellyfin_relay.dart

@@ -53,8 +53,6 @@ void mountJellyfinRelayRoute(
     switch (session.gate(token)) {
       case MediaGate.ok:
         break;
-      case MediaGate.forbidden:
-        return _plain(403);
       default:
         return _plain(401);
     }