Add NetUP IPTV integration module (TV Welcome settings page)

- DB: migrations/002_netup.sql — netup_settings + netup_room_mapping tables
- Backend: routes/netup.ts — GET/PATCH settings, POST test, GET/POST room
  mappings, POST send TV message; notifyNetupCheckin/Checkout helpers
- Backend: bookings PATCH — fire-and-forget NetUP check-in/out on status change
- Frontend: TvWelcomePage — connection settings tab + room mapping tab
- Frontend: sidebarItem added to tv-welcome module (shows in sidebar menu)
- Frontend: ModulesPage Settings button navigates to /tv-welcome
- Frontend: BookingModal — "Сообщение гостю на TV" panel for existing bookings

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

src/App.tsx

@@ -36,6 +36,7 @@ import { DiscountsPage } from './pages/DiscountsPage'
 import { GuestReviewPage } from './pages/GuestReviewPage'
 import { GuestRoomServicePage } from './pages/GuestRoomServicePage'
 import { ResetPasswordPage } from './pages/ResetPasswordPage'
+import { TvWelcomePage } from './pages/TvWelcomePage'
 
 export default function App() {
   return (
@@ -81,6 +82,7 @@ export default function App() {
                 <Route path="/loyalty"         element={<LoyaltyPage />} />
                 <Route path="/maintenance"     element={<MaintenancePage />} />
                 <Route path="/discounts"       element={<DiscountsPage />} />
+                <Route path="/tv-welcome"     element={<TvWelcomePage />} />
               </Route>
 
               <Route path="/" element={<Navigate to="/login" replace />} />