fix: 썸네일 이미지 포맷 유지

[lsy1307]

요약

• 생성되는 썸네일 키에 원본 이미지 확장자를 반영합니다.
• 썸네일 출력 인코딩을 원본 이미지 포맷에 맞춥니다.
• S3 Content-Type을 썸네일 포맷에 맞게 설정합니다.

테스트

• node --check modules\shared_resources\src\thumbnail\index.js

Summary by CodeRabbit

릴리스 노트

• 새로운 기능

  • 썸네일이 이제 원본 이미지 형식(JPEG, PNG, WebP)을 유지합니다.
  • 썸네일 파일명이 원본 파일 확장자를 포함하도록 개선되었습니다.

• 개선사항

  • S3 썸네일 생성 프로세스가 더욱 안정적으로 최적화되었습니다.

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@modules/shared_resources/src/thumbnail/index.js`:
- Around line 62-64: The thumbnail key currently uses only the basename which
causes collisions; modify the thumbnailKey construction to preserve the original
object's path. Use the existing key (or derive directory via splitting or
path.dirname) and include that directory when building thumbnailKey (e.g.,
prepend the original directory between THUMBNAIL_PREFIX and the modified
filename) while still appending `${nameWithoutExt}_thumb${extension}`, and
ensure you handle keys with no directory (root) and avoid duplicate slashes;
update the variables fileName, nameWithoutExt, thumbnailKey, key, extension
accordingly.

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Fix all unresolved CodeRabbit comments on this PR:

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• modules/shared_resources/src/thumbnail/index.js

[Hexeong]

LGTM! 고생하셨습니다~