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>

backend/migrations/002_netup.sql

@@ -0,0 +1,21 @@
+-- HotelSync Migration 002 — NetUP IPTV Integration
+-- Отдельные таблицы под модуль "Приветствие на TV"
+
+CREATE TABLE IF NOT EXISTS netup_settings (
+  hotel_id         UUID        PRIMARY KEY REFERENCES hotels(id) ON DELETE CASCADE,
+  server_url       TEXT        NOT NULL DEFAULT '',
+  username         TEXT        NOT NULL DEFAULT 'admin',
+  password         TEXT        NOT NULL DEFAULT '',
+  default_language TEXT        NOT NULL DEFAULT 'ru_RU',
+  enabled          BOOLEAN     NOT NULL DEFAULT true,
+  created_at       TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  updated_at       TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Сопоставление: номер в PMS → номер в NetUP
+CREATE TABLE IF NOT EXISTS netup_room_mapping (
+  hotel_id          UUID    NOT NULL REFERENCES hotels(id) ON DELETE CASCADE,
+  pms_room_id       UUID    NOT NULL REFERENCES rooms(id) ON DELETE CASCADE,
+  netup_room_number TEXT    NOT NULL,
+  PRIMARY KEY (hotel_id, pms_room_id)
+);