결제 전환 목표 아키텍처 정의 #1

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```mermaid
sequenceDiagram
participant User
participant Controller
participant Service
participant Repository
participant ExternalGateway
User->>Controller: 결제 요청
Controller->>Service: 결제 처리 요청
Service->>Repository: 트랜잭션 시작
alt 정상 흐름
Service->>ExternalGateway: 결제 요청
ExternalGateway-->>Service: 결제 성공
Service->>Repository: 트랜잭션 커밋
else 외부 실패
Service->>Repository: 트랜잭션 롤백
else DB 실패
Service->>Repository: 트랜잭션 롤백
end
```