fixed erros with new user.mdoel

src/main/kotlin/com/oliver/kidio/backend/domain/models/User.kt

@@ -0,0 +1,13 @@
+package com.oliver.kidio.backend.domain.models
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class User(
+    val id: String,
+    val email: String,
+    val passwordHash: String,
+    val familyName: String,
+    val childAge: Int,
+    val parentPin: String
+)

src/main/kotlin/com/oliver/kidio/backend/domain/repository/ExposedKidioRepository.kt

@@ -264,7 +264,7 @@ class ExposedKidioRepository : KidioRepository {
                         parentPin = it[UserTable.parentPin],
                     )
                 }
-                .singian    leOrNull()
+                .singleOrNull()
         }
 
     override suspend fun verifyPassword(