Payments
Records only. Enable actual payment capture (Stripe/etc.) after LLC. For now: log cash/check/Venmo received.
Scaffolded, awaiting UI.
Data table payments exists in both D1 and IndexedDB and syncs
through /api/sync. To flesh out this screen, mirror the pattern
in src/routes/customers/: list page + [id]/ editor
using upsert() from $lib/db/mutations.