[RayLi-Muye]

Relates #2.

Scope

• Tuned /zh/about and /en/about metadata descriptions to better influence Bing search result snippets.
• Updated the visible About intro copy so Bing has business-clear page text to draw from instead of assembling a snippet from navigation labels plus older poetic copy.
• Added CONTEXT.md terms for Search Result Snippet, Meta Description, and Visible Intro Copy, recording the owner-approved boundaries from this discussion.
• Updated docs/SEO.md, docs/DEVELOPMENT_LOG.md, and Playwright coverage for the new About summary wording.

Owner-approved content boundary

• Chinese and English About summaries should stay semantically aligned.
• The summary should identify Shenzhen context, design scope, and founders before more atmospheric brand language.
• Search snippets may mention contact availability and WeChat MIST-ARCH, but should not target direct phone numbers, email addresses, or street addresses for snippet display.
• This PR does not change layout, visual direction, homepage copy, project pages, production deployment, or Bing/Webmaster state.

Verification

• npm run typecheck
• npm run lint
• npm run build
• npm run test:e2e - 9 Chromium tests passed
• git diff --check

Docs impact

• Adds root CONTEXT.md for SEO/domain language.
• Updates docs/SEO.md with snippet behavior and About target descriptions.
• Updates docs/DEVELOPMENT_LOG.md with the implementation and verification notes.

Risk / rollback

• Risk is limited to About page wording and metadata snippets.
• Search result snippets are controlled by Bing and may lag or be rewritten after deployment.
• Rollback is a normal revert of this PR; no production data or webmaster state is changed here.

Owner decision needs

• Review the visible /zh/about and /en/about intro wording in preview before merge/deploy.
• Merge, preview deploy, production deploy, IndexNow submission, and Bing Request indexing remain separate owner decisions.