[stakach]

Closes #106

Adds task migrate:desk_assets [dry_run=true]. It moves desks from desks metadata on level zones into the asset table, all in one transaction.

• Collect: authorities with config.org_zone → walk the zone tree → for each level, its branch (org, region if any, building, level) and its desks metadata
• Migrate:
  • Per authority, create or reuse the _DESKS_ category and type
  • Upsert assets on (type, zone_id, map_id), following the field map in the issue
  • Remap asset_id/asset_ids on desk bookings, plus asset overrides on booking_instances. When a desk id exists on several levels, booking.zones decides which one
  • Deep-merge {"desk": {"use_assets": true}} into each org zone's settings
• Summary: per domain created/updated/skipped desks and settings changes, plus booking totals: remapped, already migrated and missed (with the missed desk ids)

Re-runs update existing assets in place, and bookings that already point at a desk asset are counted as "already migrated". dry_run=true prints the summary and then rolls back.

init had no specs, so this adds ./test, a docker compose file, a models migrator (copied from rest-api) and a CI test job.

Review

• ./test: 6 examples, 0 failures
• Smoke test of the built task binary against migrated Postgres: dry run (nothing written) → run (2 assets, 2 bookings remapped, 1 stale miss, settings merged and existing keys kept) → re-run (0 created, 2 updated, 2 already migrated, no duplicates)
• Notes:
  • Bookings are updated with raw SQL on purpose, so no booking callbacks, notifications or history entries are written
  • Uses Database.connection { db.exec(..., args: [...]) } rather than exec_sql. exec_sql opens a new connection outside the transaction, and the splat form crashed the Crystal compiler in the spec build
  • Asset#name isn't in the mapping, so it stays nil
  • Known limitation: if a booking's desk was deleted but a desk with the same id exists on exactly one level of another domain, the booking is remapped to that desk

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