A fresh production environment only ran migrations, so the four built-in
platform templates were never inserted unless someone manually ran
dev-seed (which also writes broad demo data). Extract the platform
template upsert into a reusable repository.EnsurePlatformTemplates and
add a standalone cmd/seed-platform-templates that calls it. Bake the
binary into the migrate image and chain it after migrate up in both
docker-compose and the k3s migration job (mounting app config so the
binary can dial the right database).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>