DebateJoinResponseDto

{
  "debateId": 1,
  "topic": "기본소득 도입에 찬성하십니까?",
  "participants": [
    {
      "userId": 1,
      "nickname": "user1",
      "team": "AGREE",
      "isCurrentSpeaker": true
    },
    {
      "userId": 2,
      "nickname": "user2",
      "team": "DISAGREE",
      "isCurrentSpeaker": false
    }
  ],
  "rtcConnectionInfo": {
    "iceServers": [
      {
        "urls": ["stun:stun.l.google.com:19302"]
      }
    ],
    "sessionId": "session123"
  }
}