Update OKF docs bundle, README, and CLAUDE.md for today's features

Documents the shift planning and closure/payroll modules (new tables,
routes, stores), the dark redesign, and the docker-compose-broken-host
workaround. Adds CLAUDE.md pointing agents at docs/. Translates README to
English and keeps host-specific infrastructure details out of the repo.

docs/data-model/index.md

@@ -4,3 +4,8 @@ SQLite via `better-sqlite3`, schema created on boot in `backend/src/db/index.ts`
 
 - [employees](./employees.md) - the whitelist of employee emails, with a soft-delete active flag
 - [attendance_events](./attendance-events.md) - append-only clock-in/out/break log and the derived state machine
+- [shift_slots](./shift-slots.md) - bookable shifts generated from a weekly template or added ad hoc
+- [shift_signups](./shift-signups.md) - an employee's claim on a slot
+- [pay_rates](./pay-rates.md) - versioned hourly rate per employee
+- [month_closures](./month-closures.md) - the confirm -> lock workflow per employee per month
+- [payroll](./payroll.md) - computed + admin-adjusted pay per employee per month