MZ Online Relay Server

Endpoints:
  /ws?code=ABCDEF - Join/create private room
  /ws?matchmaking=true - Join random matchmaking (&queue=rated: Rated Match)
  /api/queues?version=V - Players searching in each queue
  /ws/tournament/:id - Subscribe to tournament bracket updates
  /api/leaderboard - Get aura captains
  /api/record-win - Record an online win
  /api/tournaments - List / create tournaments
  /api/tournaments/:id - Tournament state / join / start / report
  /api/bug-report - Submit bug report (multipart)
  /health - Health check