Cost Centre on PO forms now shows only Vessels (plain vesselId field).
Sites are a separate concept and not selectable as cost centres.
- PurchaseOrder.vesselId is required again (NOT NULL restored)
- Vessel.siteId and vessel->site relation removed from schema
- DB migration: drops Vessel.siteId column, restores PO.vesselId NOT NULL
- All PO forms (new/edit/import/manager-edit): plain vessel <select> with
code-prefixed labels (e.g. "HNR1 — HNR 1")
- History, approvals, dashboard, my-orders, payments: back to vesselId
filter params and po.vessel.name display
- Admin vessels: removed Site column and site-assignment dropdown
- Admin sites detail page: removed "Assigned Vessels" section
- Sites table: removed Vessels count column (no longer linked)
- seed-prod.ts and seed.ts: vessels created without siteId
- SearchableSelect accounting code picker retained from previous commit
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
