feat: ai요약 기능 뼈대 구현

[chunny-k]

이벤트 리스너를 이용해 Ai 요청 비동기처리 코드 작성.
요약의 구체 로직을 정하기 이전까지의 코드입니다.

Summary by CodeRabbit

• New Features

  • Added access to the four most recently uploaded study files, including uploader, title, week, status, and upload time.
  • Added real-time upload processing updates, including extracting, review-ready, and failure statuses.
  • Upload events now identify the associated study material for more accurate status notifications.

• Bug Fixes

  • Improved study-specific file association and upload history retrieval.
  • Added clearer handling when content extraction fails.

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/#20-userUploadDataFlow

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