chore: 버전 0.9.0으로 상향

[jeongph]

0.9.0 릴리즈를 위한 버전 상향과 변경이력 추가.

• package.json 버전을 0.9.0으로 올린다
• website/src/content/changelog/{ko,en}/0.9.0.md 를 함께 추가한다

담긴 변경은 #45 — 사이드바를 git 저장소 단위로 묶고 하위 폴더도 함께 표시.

npm run build 로 변경이력 스키마 통과와 렌더 결과를 확인했다.

🤖 Generated with Claude Code

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Reviewing files that changed from the base of the PR and between f935843 and 6bc8feb.

⛔ Files ignored due to path filters (1)

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📒 Files selected for processing (3)

• package.json
• website/src/content/changelog/en/0.9.0.md
• website/src/content/changelog/ko/0.9.0.md

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