docs: README 아키텍처와 비동기 시퀀스 정리

[ohhalim]

변경 사항

• README 서버 아키텍처 다이어그램 교체
• 비동기 주문 처리 시퀀스 이미지를 서버 아키텍처 아래로 이동
• API 역할 표에서 동기 201 표현 제거
• 동기 201 완료 응답과 비동기 202 접수 응답 비교 기준 명확화
• 개선 사항 섹션명을 병목 분리 및 검증 기록으로 변경

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: dfada9e4-1fb3-4984-bf4c-a45dde3be2fd

📥 Commits

Reviewing files that changed from the base of the PR and between 2b2da94 and 629852b.

⛔ Files ignored due to path filters (2)

• .docs/images/async-order-sequence.png is excluded by !**/*.png
• .docs/images/server-architecture.png is excluded by !**/*.png

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/readme-architecture-sequence-images

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