feat(subscription): rename permit→subscription + monthly pricing

The "permit/lejet" feature is really a subscription. Full rename of the
mutable master data, plus a recurring monthly price.

- DB (migration 0004, data-preserving ALTER RENAME): permits→subscriptions,
  permit_credentials/_plates→subscription_*, sessions.permit_id→subscription_id.
- Pricing: per-subscription priceMinor + period(monthly) + currency, with a
  site default (site_config.subscription_monthly_price_minor) pre-filling the form.
- Server: subscription-flow.ts (SubscriptionFlow), routes/subscriptions.ts
  (/api/subscriptions). Web: SubscriptionManager, route, i18n (sq Abonimet/en).
- The signed ledger `permitId` payload is intentionally kept — immutable
  hash-chained history; renaming it would break verification of past events.

Deferred (wiki notes): fee collection into the ledger/shift (a shift-attributed
payment), LPR/ANPR plate source, time-of-day access windows (overnight subscriber).

Also carries the device-footer UI surface (api DeviceStatus, router mount,
i18n devices) due to shared-file overlap with the preceding footer commit.

Verified end-to-end on a fresh DB and migration on a live-DB copy (sessions
preserved). Live DB migrated. Full monorepo builds clean.

Claude-Session: https://claude.ai/code/session_01Xcm6ikLgGoCxxHrxtjkk5V

apps/server/src/server.ts

@@ -10,16 +10,17 @@ import { EntryFlow } from "./entry-flow.js";
 import { EventLog } from "./event-log.js";
 import { ExitFlow } from "./exit-flow.js";
 import { PayStation } from "./pay-station.js";
-import { PermitFlow } from "./permit-flow.js";
+import { SubscriptionFlow } from "./subscription-flow.js";
 import { ShiftService } from "./shift-service.js";
 import { ReadDispatcher } from "./read-dispatch.js";
 import { PrinterMonitor } from "./printer-monitor.js";
+import { DeviceMonitor } from "./device-monitor.js";
 import { buildSigner, buildVerifier } from "./signer.js";
 import { authRoutes } from "./routes/auth.js";
 import { deviceRoutes } from "./routes/devices.js";
 import { eventRoutes } from "./routes/events.js";
 import { payRoutes } from "./routes/pay.js";
-import { permitRoutes } from "./routes/permits.js";
+import { subscriptionRoutes } from "./routes/subscriptions.js";
 import { qrReaderRoutes } from "./routes/qr-reader.js";
 import { shiftRoutes } from "./routes/shift.js";
 import { siteRoutes } from "./routes/site.js";
@@ -27,6 +28,7 @@ import { snapshotRoutes } from "./routes/snapshots.js";
 import { tariffRoutes } from "./routes/tariffs.js";
 import { printerRoutes } from "./routes/printers.js";
 import { setupRoutes } from "./routes/setup.js";
+import { deviceStatusRoutes } from "./routes/device-status.js";
 import { wsRoutes } from "./routes/ws.js";
 
 // The backend is Fastify (Node). Hardware drivers live as isolated Fastify
@@ -86,6 +88,15 @@ export async function buildServer(opts: BuildOptions = {}): Promise<FastifyInsta
   app.addHook("onReady", async () => printerMonitor.start());
   app.addHook("onClose", async () => printerMonitor.stop());
 
+  // Unified device-status monitor: polls EVERY configured device (relays/readers/
+  // cameras via healthCheck, printers via rich readStatus) and feeds the booth's
+  // device-status footer over the WS. Read-only — never drives a relay.
+  // See wiki/concepts/device-status-monitoring.md.
+  const deviceMonitor = new DeviceMonitor(db, app.log);
+  await deviceStatusRoutes(app, deviceMonitor);
+  app.addHook("onReady", async () => deviceMonitor.start());
+  app.addHook("onClose", async () => deviceMonitor.stop());
+
   // Append-only signed business LEDGER (ledger_events). Holds only business facts
   // (vehicle_entry/exit, payment, void, …) — the anti-fraud audit trail. A raw
   // button press is NOT a business fact: it's device telemetry, recorded UNSIGNED
@@ -101,7 +112,7 @@ export async function buildServer(opts: BuildOptions = {}): Promise<FastifyInsta
 
   // Live booth feed: server-pushed ledger + occupancy + printer-status over a
   // single authenticated WebSocket (/api/ws). See routes/ws.ts.
-  await wsRoutes(app, db);
+  await wsRoutes(app, db, deviceMonitor);
 
   // Entry/exit camera snapshots (BLOB-in-DB), read-only. See snapshot.ts.
   await snapshotRoutes(app, db);
@@ -117,11 +128,12 @@ export async function buildServer(opts: BuildOptions = {}): Promise<FastifyInsta
   app.addHook("onClose", async () => unsubscribeEntry());
 
   // Read-driven flows: a credential read (ticket scan / plate / card) routes via the
-  // dispatcher to either the PERMIT flow (if it matches a permit) or the transient
-  // EXIT flow. See read-dispatch.ts, exit-flow.ts, permit-flow.ts, parking-session.md.
+  // dispatcher to either the SUBSCRIPTION flow (if it matches a subscription) or the
+  // transient EXIT flow. See read-dispatch.ts, exit-flow.ts, subscription-flow.ts,
+  // parking-session.md.
   const exitFlow = new ExitFlow(db, eventLog, app.log);
-  const permitFlow = new PermitFlow(db, eventLog, app.log);
-  const readDispatcher = new ReadDispatcher(db, exitFlow, permitFlow, app.log);
+  const subscriptionFlow = new SubscriptionFlow(db, eventLog, app.log);
+  const readDispatcher = new ReadDispatcher(db, exitFlow, subscriptionFlow, app.log);
   const unsubscribeRead = deviceEvents.onRead((e) => {
     void readDispatcher.dispatch(e);
   });
@@ -147,8 +159,8 @@ export async function buildServer(opts: BuildOptions = {}): Promise<FastifyInsta
   // the pay station prices against. See wiki/concepts/tariff.md.
   await tariffRoutes(app, db);
 
-  // Permit (subscription) admin CRUD. See wiki/entities/permit.md.
-  await permitRoutes(app, db);
+  // Subscription admin CRUD. See wiki/entities/subscription.md.
+  await subscriptionRoutes(app, db);
 
   // Shift open/close + drawer endpoints (shiftService constructed above).
   await shiftRoutes(app, shiftService);