[Refactor] README 전면 개편 및 스크린샷 추가

[pooreumjung]

🧾 요약

• 프로젝트 소개, 아키텍처, 기술 스택, 프로젝트 구조, 시작 방법 등을 포함한 README를 전면 개편하고 주요 기능 스크린샷 추가

🔗 이슈

• close [refactor] README.md 수정 #169

✨ 변경 내용

• README.md 전면 재작성 — 아키텍처 다이어그램(Mermaid), 기술 스택, 프로젝트 구조, 시작 방법, 개발 규칙 추가
• assets/screenshots/ 디렉토리 추가 및 주요 기능 스크린샷 6장 포함
• 구버전 Claude Code 사용 가이드 섹션 제거

✅ 확인

• 빌드 OK
• 테스트 OK

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch refactor/#169-readme

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

본 PR은 프로젝트의 공식 문서인 README.md를 전면 개편하여 신규 참여자가 프로젝트의 구조와 기술 스택, 개발 규칙을 한눈에 파악할 수 있도록 개선했습니다. 아키텍처 다이어그램과 시각적인 스크린샷을 도입하여 프로젝트의 기능적 이해도를 높이는 데 중점을 두었습니다.

Highlights

• README 전면 개편: 프로젝트 소개, 아키텍처 다이어그램(Mermaid), 기술 스택, 프로젝트 구조, 시작 방법 및 개발 규칙을 포함하여 README.md를 전면 재작성했습니다.
• 스크린샷 추가: assets/screenshots/ 디렉토리를 신설하고, 정복 지도, 세모피드, 실시간 GPS 트래킹 등 주요 기능에 대한 스크린샷 6장을 추가하여 가독성을 높였습니다.
• 가이드 정리: 구버전 Claude Code 사용 가이드 섹션을 제거하고, 프로젝트의 최신 개발 환경과 규칙을 명확히 정리했습니다.

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[gemini-code-assist]

Code Review

This pull request comprehensively updates the README.md file, adding detailed sections on the system architecture, API documentation, key features, technology stack, project structure, and local setup instructions. The review feedback points out an inaccuracy in the Mermaid architecture diagram regarding how Prometheus scrapes metrics from the Spring Boot API and provides a corrected diagram suggestion.