[services] Bump process-compose version and fix extra stderr output (#2832)

## Summary

- Bumps `processComposeVersion` from 1.87.0 to 1.110.0.
- Skips `Add` for utilities whose exact versioned name is already in the
utility devbox config. Calling `Add` anyway printed noisy `Package
"process-compose@..." already in devbox.json` output on every services
interaction. A version mismatch (e.g. after bumping
`processComposeVersion`) still falls through to `Add`, which replaces
the existing package by canonical name.

nginx.conf and devbox.lock have minor automated changes.

## Test plan

- [x] `devbox services up` / `devbox services ls` no longer prints the
"already in devbox.json" line.
- [x] Bumping `processComposeVersion` triggers a clean replace path (no
stale 1.87.0 left behind).
- [x] Fresh install (no existing utility config) still adds
process-compose correctly.