[#21] bugfix: chatroom 관련 오류해결

models/chatRooms.js

-const mongoose = require('mongoose');
-
-// MongoDB 채팅방 스키마 수정 (FCM 토큰을 배열로 관리)
-const chatRoomsSchema = new mongoose.Schema({
-  chatRoomId: { type: String, required: true, unique: true },
-  chatRoomName: { type: String, required: true },
-  messages: [{
-    sender: String,
-    message: String,
-    timestamp: Date,
-    type: { type: String, default: 'message' }, // 기본값은 'message', 다른 값으로 'join', 'leave' 가능
-  }],
-  participants: [{
-    name: { type: String, required: true },
-    fcmTokens: { type: [String], default: [] }, // FCM 토큰 배열
-  }],
-  lastReadAt: { type: Map, of: Date },
-  lastReadLogId: { type: Map, of: String },
-  isOnline: { type: Map, of: Boolean },
-}, { collection: 'chatrooms' });
-
-const ChatRoom = mongoose.model('ChatRooms', chatRoomsSchema);
-module.exports = ChatRoom;
\ No newline at end of file