Merge stash changes after pulling main

Author: LimByeongSu

backend/src/main/java/com/backend/domain/user/service/EmailService.java

@@ -4,13 +4,11 @@
 import jakarta.mail.MessagingException;
 import jakarta.mail.internet.MimeMessage;
 import lombok.RequiredArgsConstructor;
-import org.springframework.mail.SimpleMailMessage;
 import org.springframework.mail.javamail.JavaMailSender;
 import org.springframework.mail.javamail.MimeMessageHelper;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
-
 import java.util.Random;
 
 @Service