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/architecture/overview.md

@@ -3,7 +3,7 @@ type: Architecture Overview
 title: System overview
 description: How the EatMe frontend, backend, and database fit together.
 tags: [architecture, backend, frontend]
-timestamp: 2026-08-12T00:00:00Z
+timestamp: 2026-08-16T00:00:00Z
 ---
 
 # System overview
@@ -13,7 +13,9 @@ one Docker image in production.
 
 - **`backend/`** — Express + TypeScript API, SQLite via `better-sqlite3`
   (entry point `backend/src/index.ts`). Owns all state: employee whitelist,
-  attendance events, sessions.
+  attendance events, shift planning, pay rates, month closures, and
+  payroll. Jest tests (`backend/src/services/*.test.ts`) cover the
+  service-layer workflows.
 - **`frontend/`** — Vite + React + TypeScript PWA (entry point
   `frontend/src/App.tsx`). Talks to the backend only over `/api/*`; in dev,
   Vite proxies that path to `http://localhost:4000` (see
@@ -37,11 +39,12 @@ one Docker image in production.
 
 ## Design language
 
-The UI follows the "light monochrome TUI" style defined at
-`~/doc/concepts/ui/light-mono-tui.md`: grey page background, black type and
-1px borders, mono font, inverted fills for active/hover state, no accent
-colors, no border-radius. Implemented as plain CSS tokens in
-`frontend/src/styles/tui.css`.
+Dark, sharp-edged (no border-radius) UI with a single warm amber accent
+used sparingly (active tab, "this is mine" states) — not the colored
+left/right accent-border pattern common in AI-generated designs. Started
+as a light monochrome TUI style and was deliberately redesigned dark on
+2026-08-16; see [Design system](/docs/frontend/design-system.md). All
+tokens/component classes live in `frontend/src/styles/theme.css`.
 
 ## Related