[feat] 회원가입 응답에 userId 추가

[worudgks98]

📌 관련 이슈

• close [feat] 회원가입 API 응답에 userId 추가 #153

✨ 작업 내용

• 회원가입 API 응답에 userId 추가
• 회원가입 전용 'SignupResponse' DTO 생성
• 회원가입 서비스 테스트에 userId 응답 검증 추가

📸 스크린샷 (선택)

[coderabbitai]

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