docs(ud): API route prefix

[Tobbe]

Document route prefix

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[greptile-apps]

Greptile Summary

This PR documents the API route prefix configuration for Universal Deploy, adding a new section that explains apiUrl in cedar.toml, the --apiRootPath CLI flag, and the CEDAR_API_ROOT_PATH environment variable and how they interact.

• The precedence table and prose accurately reflect the implementation in vite-plugin-cedar-universal-deploy.ts and buildUDApiServer.ts.
• One factual inaccuracy: the generated vercel.json from yarn cedar setup deploy vercel --ud only contains yarn cedar build --ud --verbose — it does not include --apiRootPath=/.api/functions, contrary to the doc's claim that both Netlify and Vercel configure this automatically.

Confidence Score: 4/5

Safe to merge once the Vercel claim is corrected; all other details match the implementation.

The Netlify setup correctly includes --apiRootPath=/.api/functions in its build command, but the Vercel setup only generates yarn cedar build --ud --verbose with no route-prefix flag. Developers targeting Vercel who rely on this doc may ship a broken deployment.

docs/docs/deploy/universal-deploy.md — the paragraph claiming Vercel auto-configures --apiRootPath.

Important Files Changed

Filename	Overview
docs/docs/deploy/universal-deploy.md	Adds a new "API route prefix" section documenting apiUrl, --apiRootPath, and CEDAR_API_ROOT_PATH; the claim that Vercel auto-configures --apiRootPath is incorrect per the source.

_{Reviews (2): Last reviewed commit: "tweak apiUrl doc" | Re-trigger Greptile}