dev add field locale for get info for view doc

src/main/java/ru/soune/nocopy/service/user/UserService.java

@@ -41,6 +41,13 @@ public class UserService {
         return userRepository.save(user);
     }
 
+    public String userEmailById(Long userId) {
+        User user = userRepository.findById(userId)
+                .orElseThrow(() -> new UserNotFoundException("User not found with id: " + userId));
+
+        return user.getEmail();
+    }
+
     @Transactional
     public UserDTO updateUser(UserRequest userRequest, User currentUser) {
         User user = userRepository.findById(currentUser.getId())