feat(character-detail/gallery): 갤러리 추가 및 이미지 목록 연동

- 에셋 추가: ic_new_lock
- 그리드 UI 적용

SodaLive/Sources/Chat/Character/Detail/Gallery/CharacterDetailGalleryViewModel.swift

@@ -0,0 +1,23 @@
+//
+//  CharacterDetailGalleryViewModel.swift
+//  SodaLive
+//
+//  Created by klaus on 9/2/25.
+//
+
+import Foundation
+import Combine
+import Moya
+
+final class CharacterDetailGalleryViewModel: ObservableObject {
+    // MARK: - Published State
+    @Published var isLoading: Bool = false
+    @Published var errorMessage: String = ""
+    @Published var isShowPopup = false
+    
+    // MARK: - Private
+    private let repository = CharacterDetailGalleryRepository()
+    private var subscription = Set<AnyCancellable>()
+    
+    // MARK: - Public Methods
+}