ASAP-110 feat: 편지 열람 가능여부 검증 api 구현 및 테스트 추가

[tlarbals824]

• 편지 열람 가능여부 검증 api 구현 및 테스트 추가
• 편지 열람 검증 flow

sequenceDiagram
    participant User
    participant VerifyLetterAccessibleUsecase
    participant LetterCommandService
    participant SendLetterManagementPort
    participant UserManagementPort
    participant LetterException

    User ->> VerifyLetterAccessibleUsecase: verify(command)
    VerifyLetterAccessibleUsecase ->> LetterCommandService: verify(command)
    Note right of LetterCommandService: 편지가 이전에 검증되었는지 확인
    LetterCommandService ->> SendLetterManagementPort: verifiedLetter(DomainId(command.userId), command.letterCode)

    alt 동일한 사용자가 열람한적이 있음
        LetterCommandService ->> SendLetterManagementPort: getExpiredLetterNotNull(DomainId(command.userId), command.letterCode)
        SendLetterManagementPort -->> LetterCommandService: sendLetter
        LetterCommandService ->> VerifyLetterAccessibleUsecase: VerifyLetterAccessibleUsecase.Response(letterId = sendLetter.id.value)
    else 이전에 열람한 적 없음
        LetterCommandService ->> SendLetterManagementPort: getLetterByCodeNotNull(command.letterCode)
        SendLetterManagementPort -->> LetterCommandService: sendLetter
        LetterCommandService ->> UserManagementPort: getUserNotNull(DomainId(command.userId))
        UserManagementPort -->> LetterCommandService: user
        LetterCommandService ->> sendLetter: isSameReceiver { user.username }
        alt 수신자 이름과 동일함
            LetterCommandService ->> SendLetterManagementPort: expireLetter(DomainId(command.userId), sendLetter.id)
            SendLetterManagementPort -->> LetterCommandService: expired
            LetterCommandService ->> VerifyLetterAccessibleUsecase: VerifyLetterAccessibleUsecase.Response(letterId = sendLetter.id.value)
        else 수신자 이름과 동일하지 않음
            LetterCommandService ->> LetterException: throw InvalidLetterAccessException()
        end
    end

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