Use @Singleton where possible

app/src/main/java/gq/kirmanak/mealient/data/auth/impl/AuthDataSourceImpl.kt

@@ -12,7 +12,9 @@ import retrofit2.HttpException
 import retrofit2.Response
 import timber.log.Timber
 import javax.inject.Inject
+import javax.inject.Singleton
 
+@Singleton
 class AuthDataSourceImpl @Inject constructor(
     private val authServiceFactory: ServiceFactory<AuthService>,
     private val json: Json,

app/src/main/java/gq/kirmanak/mealient/data/auth/impl/AuthRepoImpl.kt

@@ -11,7 +11,9 @@ import kotlinx.coroutines.flow.map
 import okhttp3.HttpUrl.Companion.toHttpUrl
 import timber.log.Timber
 import javax.inject.Inject
+import javax.inject.Singleton
 
+@Singleton
 class AuthRepoImpl @Inject constructor(
     private val dataSource: AuthDataSource,
     private val storage: AuthStorage,

app/src/main/java/gq/kirmanak/mealient/data/auth/impl/AuthStorageImpl.kt

@@ -9,10 +9,12 @@ import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.map
 import timber.log.Timber
 import javax.inject.Inject
+import javax.inject.Singleton
 
 private const val AUTH_HEADER_KEY = "AUTH_TOKEN"
 private const val BASE_URL_KEY = "BASE_URL"
 
+@Singleton
 class AuthStorageImpl @Inject constructor(
     private val sharedPreferences: SharedPreferences
 ) : AuthStorage {