refactor: 리포지토리를 뷰모델에 노출 제거

Author: opficdev

DevLog/Domain/UseCase/Auth/Session/AuthSessionUseCase.swift

@@ -5,6 +5,9 @@
 //  Created by 최윤진 on 12/31/25.
 //
 
+import Combine
+
 protocol AuthSessionUseCase {
+    var signedInPublisher: AnyPublisher<Bool, Never> { get }
     func execute(_ signIn: Bool)
 }

DevLog/Domain/UseCase/Auth/Session/AuthSessionUseCaseImpl.swift

@@ -5,9 +5,15 @@
 //  Created by 최윤진 on 12/31/25.
 //
 
+import Combine
+
 final class AuthSessionUseCaseImpl: AuthSessionUseCase {
     private let repository: AuthSessionRepository
 
+    var signedInPublisher: AnyPublisher<Bool, Never> {
+        repository.signedInPublisher
+    }
+
     init(_ repository: AuthSessionRepository) {
         self.repository = repository
     }

DevLog/Presentation/ViewModel/LoginViewModel.swift

@@ -50,7 +50,7 @@ final class LoginViewModel: Store {
         self.signOutUseCase = signOutUseCase
         self.sessionUseCase = sessionUseCase
 
-        self.sessionUseCase.repository.signedInPublisher
+        self.sessionUseCase.signedInPublisher
             .removeDuplicates()
             .receive(on: DispatchQueue.main)
             .sink { [weak self] signIn in