Major UX improvements across multiple pages

Шахматка:
- Date/period picker dropdown on navigation button (choose start date + days window)
- Cancelled bookings fade out with animation after 1 second

Бронирования:
- Clickable column headers with sort asc/desc (Гость, Заезд, Выезд, Статус, Источник, Сумма)

Страница входа:
- Removed role-based account selector — just email + password
- System auto-detects role/hotel from credentials

Настройки:
- New "Бронирование" section with room assignment strategy (spread/together/sequential/manual)
- Notifications: SMTP email config + SMS provider config (SMSC, SMS.ru, МТС, etc.)

Модули:
- Added Housekeeping and Channel Manager as proper modules
- Channel Manager lists: Booking.com, Airbnb, Яндекс Путешествия, Островок, Суточно.ру, OneTwoTrip
- Housekeeping visible to all roles (including housekeeper) via module status
- Sidebar now uses module status to show/hide Уборка and Каналы

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

backend/src/types.ts

@@ -0,0 +1,71 @@
+export interface JwtPayload {
+  sub: string         // user.id (UUID)
+  email: string
+  name: string
+  role: 'manager' | 'housekeeper' | 'super_admin'
+  hotelId: string | null
+  hotelSlug: string | null
+}
+
+export interface Hotel {
+  id: string
+  name: string
+  slug: string
+  plan: 'starter' | 'pro' | 'enterprise'
+  timezone: string
+  currency: string
+  created_at: string
+  updated_at: string
+}
+
+export interface Room {
+  id: string
+  hotel_id: string
+  number: string
+  type: string
+  floor: number
+  capacity: number
+  price_per_night: number
+  status: 'clean' | 'dirty' | 'maintenance' | 'out_of_order'
+  amenities: string[]
+  notes: string | null
+  created_at: string
+}
+
+export interface Booking {
+  id: string
+  hotel_id: string
+  room_id: string
+  guest_name: string
+  guest_email: string | null
+  guest_phone: string | null
+  check_in: string
+  check_out: string
+  adults: number
+  children: number
+  status: 'confirmed' | 'checked_in' | 'checked_out' | 'cancelled' | 'no_show'
+  source: 'direct' | 'booking_com' | 'airbnb' | 'expedia' | 'vrbo'
+  total_amount: number | null
+  notes: string | null
+  external_id: string | null
+  created_at: string
+  updated_at: string
+}
+
+// Fastify JWT augmentation
+declare module '@fastify/jwt' {
+  interface FastifyJWT {
+    payload: JwtPayload
+    user: JwtPayload
+  }
+}
+
+// Fastify instance augmentation
+declare module 'fastify' {
+  interface FastifyInstance {
+    authenticate: (
+      request: import('fastify').FastifyRequest,
+      reply: import('fastify').FastifyReply,
+    ) => Promise<void>
+  }
+}