dflow importer pages the Payload REST collections (users API-Key
auth) and recreates projects/services: app→git web services, docker
→image, database→typed image with DATABASE_URL for external
providers; variables (empty encrypted values flagged), bind volumes,
and domains carried over; soft-deleted docs excluded.
Also fixes the Railway migrator posting type "image"/"git" — the
create API only accepts web|worker|database|cron and requires an
environment, so every service create 400'd.
Generated with [Devin](https://devin.ai)
Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
