Initial commit: EatMe attendance tracker

Google-SSO PWA for bistro employee clock-in/out, admin employee
management, and stats with CSV export. Express + SQLite backend,
React + Zustand frontend in the light-mono-tui design language.
Multi-stage Dockerfile, compose.yaml for image-based deploys, nginx
reverse-proxy template, and an OKF documentation bundle in docs/.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

docs/data-model/index.md

@@ -0,0 +1,6 @@
+# Data model
+
+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