결제 전환 목표 아키텍처 정의 #1

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```mermaid
sequenceDiagram
participant User
participant Service
participant Repository
participant PaymentGateway as PG
User->>Service: 결제 요청
Service->>Repository: 결제 정보 저장
alt 결제 성공
Service->>PG: 결제 요청
PG-->>Service: 결제 성공 응답
Service-->>User: 결제 완료 응답
else 외부 실패
Service-->>User: 결제 실패 응답
else DB 실패
Service->>Repository: 롤백 요청
Repository-->>Service: 롤백 완료
Service-->>User: 결제 실패 응답
end
```