- LoginRequestDto, LoginResponseDto 추가
- IAuthService, AuthService 구현 (BCrypt 비밀번호 검증)
- AdminRepository 구현 (GetByEmailAsync)
- AuthController 추가 (POST /v1/in/auth/login)
- DI 등록 (IAuthService, IAdminRepository)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>