Pin Node.js version

[kongwen686]

Summary

• add .nvmrc with Node 22
• add a Node 22 engines range to package.json
• sync package-lock root package engine metadata

Verification

• jq empty package.json
• node -e 'const p=require("./package.json"); console.log(p.engines.node)'\n\nNote: local Node is v20.19.2, so I did not run npm install/build against the pinned Node 22 runtime in this environment.\n\nCloses Add .nvmrc and engines field to package.json #124

[vercel]

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