feat: notifications API, auto-jobs, calendar housekeeping fixes

Backend:
- notifications table (024 migration) — stores per-hotel notifications
- GET/PATCH/POST/DELETE /api/hotels/:slug/notifications endpoints
- createNotification() helper used by jobs + future hooks
- jobs.ts — background tasks every 10min: auto-cancel no-shows and
  auto-checkout overdue stays based on hotel_settings, broadcasts WS
  events and creates notifications for each automated action

Frontend:
- CalendarPage: handle housekeeping_done WS → update room status in
  calendar in real-time (bug fix)
- CalendarPage: when manually setting room to dirty via context menu,
  auto-create housekeeping task and broadcast via WS (bug fix)
- NotificationsContext: replaced mock data with real API integration,
  polls every 60s, syncs markRead/delete to backend
- SettingsPage booking section: auto-cancel no-show toggle + hours
  selector; auto-checkout toggle + hours selector
- api.ts: notifications API methods
- useHotelSocket: notification:new WS message type

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

src/pages/CalendarPage.tsx

@@ -65,6 +65,10 @@ export function CalendarPage() {
       setBookings(prev => prev.map(b => b.id === msg.booking.id ? msg.booking : b))
     } else if (msg.type === 'booking:deleted') {
       setBookings(prev => prev.filter(b => b.id !== msg.bookingId))
+    } else if (msg.type === 'housekeeping_done') {
+      setRooms(prev => prev.map(r =>
+        r.id === msg.roomId ? { ...r, housekeepingStatus: msg.roomStatus as Room['housekeepingStatus'] } : r
+      ))
     }
   }, [])
 
@@ -153,10 +157,21 @@ export function CalendarPage() {
     try {
       const updated = await api.rooms.update(slug, roomId, patch)
       setRooms(prev => prev.map(r => r.id === updated.id ? updated : r))
+      // When manually marking room as dirty → auto-create a housekeeping task
+      if (patch.housekeepingStatus === 'dirty') {
+        const today = new Date().toISOString().slice(0, 10)
+        const task = await api.housekeeping.create(slug, {
+          room_id: roomId,
+          type: 'regular',
+          priority: 'medium',
+          due_date: today,
+        })
+        send({ type: 'housekeeping_task_created', task: task as unknown as Record<string, unknown> })
+      }
     } catch (err) {
       console.error('Failed to update room:', err)
     }
-  }, [slug])
+  }, [slug, send])
 
   const handleRentalBookingCreate = useCallback(async (b: RentalBooking) => {
     try {