chore: update site domain and vercel checks

[PerfectPan]

Summary

• Update public site references and crate metadata to https://ocvm.vercel.app.
• Add repository-root Vercel build config for the current GitHub integration and document the dashboard settings that still matter.
• Add a site GitHub Actions job that runs npm ci and npm run build.
• Clarify the landing page Install section around the pinned v0.1.1 release and add canonical/Open Graph metadata.

Validation

• cargo fmt --check
• cargo clippy --all-targets -- -D warnings
• cargo test
• npm run build --prefix site
• Root Vercel build command: cd site && npm run build && rm -rf ../.vercel && cp -R .vercel ../.vercel && test -f ../.vercel/output/config.json
• cargo package --allow-dirty --offline
• Playwright desktop/mobile screenshots against http://127.0.0.1:3000
• Publish-safety scan for private placeholders, excluding generated dependency/build artifacts

Follow-up Risks

• cargo package --allow-dirty without --offline could not reach the configured crates.io mirror (mirrors.ustc.edu.cn refused connections), so packaging was verified offline from the local cache.
• Confirm in Vercel that ocvm.vercel.app is assigned to this project and main is the production branch. The root vercel.json now supports repository-root Git deployments; if the project Root Directory is later changed to site, the site-local config can handle that mode.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
site	Ready	Preview, Comment	May 5, 2026 2:38pm