feat(chat-room) 채팅방 골격 추가

SodaLive/Sources/Chat/Talk/Room/ChatRoomViewModel.swift

@@ -0,0 +1,21 @@
+//
+//  ChatRoomViewModel.swift
+//  SodaLive
+//
+//  Created by klaus on 9/2/25.
+//
+
+import Foundation
+import Combine
+import Moya
+
+final class ChatRoomViewModel: ObservableObject {
+    // MARK: - Published State
+    @Published var isLoading: Bool = false
+    @Published var errorMessage: String = ""
+    @Published var isShowPopup = false
+    
+    // MARK: - Private
+    private let repository = ChatRoomRepository()
+    private var subscription = Set<AnyCancellable>()
+}