feat: initial commit — local services (backend + manager dashboard + waiter PWA)

Includes all work to date:
- local_backend: FastAPI backend with products, orders, tables, shifts, cloud sync
- manager_dashboard: React manager UI with product/category management, reports, settings
- waiter_pwa: React PWA for waiter devices
- Category reparent endpoint and UI
- Waiter domain: local_ip sent on heartbeat, waiter_domain persisted from cloud response
- QR code modal in AppInfoTab for waiter domain
- Product form: number input spinners removed, category pre-selected on new product
- Category row: count badge moved to far right

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

manager_dashboard/src/hooks/useLicenseStatus.js

@@ -0,0 +1,84 @@
+import { useQuery } from '@tanstack/react-query'
+import client from '../api/client'
+
+/**
+ * Polls /api/system/status every 5 minutes to stay in sync with the backend
+ * heartbeat cycle. Returns a stable object so callers can destructure safely.
+ *
+ * Returned shape:
+ *   licensed          bool
+ *   locked            bool
+ *   lock_pending      bool
+ *   lock_reason       "admin" | "expired" | null
+ *   expires_at        string | null   (ISO)
+ *   days_until_expiry number | null   (negative = expired)
+ *   grace_expires_at  string | null   (ISO)
+ *   grace_days_remaining number | null
+ *   sync_failed       bool
+ *
+ * Derived helpers:
+ *   showExpiryWarning bool  — true when 0 < days_until_expiry <= 5
+ *   inGracePeriod     bool  — true when expired but grace not yet over
+ *   isBlocked         bool  — locked=true OR (unlicensed AND grace over)
+ */
+export default function useLicenseStatus() {
+  const { data } = useQuery({
+    queryKey: ['license-status'],
+    queryFn: () => client.get('/api/system/status').then(r => r.data),
+    staleTime: 0,
+    refetchInterval: 5 * 60 * 1000,
+    refetchIntervalInBackground: true,
+  })
+
+  if (!data) {
+    return {
+      licensed: true,
+      locked: false,
+      lock_pending: false,
+      lock_reason: null,
+      expires_at: null,
+      days_until_expiry: null,
+      grace_expires_at: null,
+      grace_days_remaining: null,
+      sync_failed: false,
+      showExpiryWarning: false,
+      inGracePeriod: false,
+      isBlocked: false,
+    }
+  }
+
+  const {
+    licensed = true,
+    locked = false,
+    lock_pending = false,
+    lock_reason = null,
+    expires_at = null,
+    days_until_expiry = null,
+    grace_expires_at = null,
+    grace_days_remaining = null,
+    sync_failed = false,
+  } = data
+
+  const showExpiryWarning =
+    days_until_expiry != null && days_until_expiry >= 0 && days_until_expiry <= 5
+
+  const inGracePeriod =
+    days_until_expiry != null && days_until_expiry < 0 && licensed
+
+  const isBlocked = locked || !licensed
+
+  return {
+    licensed,
+    locked,
+    lock_pending,
+    lock_reason,
+    expires_at,
+    days_until_expiry,
+    grace_expires_at,
+    grace_days_remaining,
+    sync_failed,
+    showExpiryWarning,
+    inGracePeriod,
+    isBlocked,
+  }
+}