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/migrate.ts

@@ -0,0 +1,48 @@
+import fs from 'fs'
+import path from 'path'
+import { db } from './db'
+
+export async function runMigrations() {
+  const migrationsDir = path.join(process.cwd(), 'migrations')
+
+  // Create migrations tracking table
+  await db.query(`
+    CREATE TABLE IF NOT EXISTS _migrations (
+      id         SERIAL PRIMARY KEY,
+      name       VARCHAR(255) NOT NULL UNIQUE,
+      applied_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+    )
+  `)
+
+  const files = fs.readdirSync(migrationsDir)
+    .filter(f => f.endsWith('.sql'))
+    .sort()
+
+  for (const file of files) {
+    const { rows } = await db.query(
+      'SELECT id FROM _migrations WHERE name = $1',
+      [file],
+    )
+    if (rows.length > 0) continue // already applied
+
+    const sql = fs.readFileSync(path.join(migrationsDir, file), 'utf8')
+    console.log(`[migrate] Applying ${file}...`)
+
+    const client = await db.connect()
+    try {
+      await client.query('BEGIN')
+      await client.query(sql)
+      await client.query('INSERT INTO _migrations (name) VALUES ($1)', [file])
+      await client.query('COMMIT')
+      console.log(`[migrate] ✅ ${file} applied`)
+    } catch (err) {
+      await client.query('ROLLBACK')
+      console.error(`[migrate] ❌ ${file} failed:`, err)
+      throw err
+    } finally {
+      client.release()
+    }
+  }
+
+  console.log('[migrate] All migrations up to date')
+}