docs: add Layout foundation page

[junghyeonsu]

Summary

SEED-Docs Figma의 "Layout" spec 프레임을 새 파운데이션 문서로 옮겼습니다. docs/content/docs/foundation/layout.mdx 한 파일 추가이며, elevation.mdx와 동일한 형식(frontmatter + ## 섹션 + FigmaImage/마크다운 표)을 따릅니다.

섹션: Layout Types · Dashboard Layout · Content Layout · Grid anatomy · Responsive Behavior · Breakpoint · Column span and offset · Layout Regions

• 데이터 표 2개(대시보드 밀도, Breakpoint 스펙)는 마크다운 표로, 시각 다이어그램 7개는 <FigmaImage>로 작성
• 본문은 Figma 원문 그대로 (의역·내용 추가 없음)
• meta.json은 "..." catch-all이 자동 포함하므로 미수정

Figma

https://www.figma.com/design/M3f1E9O4BpjlpOL6CUY2MQ/SEED-Docs?node-id=1938-15494

확인 필요

Breakpoint 표의 Columns 컬럼 값이 Figma 원본에서 base/sm/md/lg/xl로 Breakpoint 컬럼과 동일합니다 (컬럼 개수가 아닌 토큰명 반복). 일단 원문대로 전사했으니, placeholder였다면 실제 값으로 교정 부탁드립니다.

Test plan

• next dev에서 /docs/foundation/layout → HTTP 200, 8개 섹션·표·이미지 렌더, 사이드바 링크 노출 확인
• MDX 파싱/컴파일 에러 없음

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📥 Commits

Reviewing files that changed from the base of the PR and between 5da5ea3 and 3f044b9.

📒 Files selected for processing (1)

• docs/content/docs/foundation/layout.mdx

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch sydney-v1

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[github-actions]

Alpha Preview (Storybook)

• Branch Preview URL: https://sydney-v1.seed-design-storybook.pages.dev
• Preview URL: https://5c6b8985.seed-design-storybook.pages.dev
• Commit: 3f044b9

[github-actions]

Alpha Preview (Docs)

• Branch Preview URL: https://sydney-v1.seed-design.pages.dev
• Preview URL: https://b1cb415d.seed-design.pages.dev
• Commit: 3f044b9