Vercel's "Root Directory" setting limits the upload to docs/api/, so
the build cannot read sibling paths like ../../server/openapi.json or
../api-content/. A small prebuild script copies both into a vendored
folder inside the project tree (gitignored).
## Changes
- Add scripts/sync-sources.mjs to copy /docs/api-content/ and
/server/openapi.json into docs/api/src/vendored/ before dev/build
- Wire predev/prebuild npm scripts so the sync runs automatically
- Update astro.config.mjs and src/content.config.ts to read from the
vendored paths
- Gitignore src/vendored/ — contributors still edit the originals
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