Rental: connect to API, improve cell UI; remove price from room labels

Backend:
- Migration 015_rental.sql: rental_objects + rental_bookings tables, seed demo data
- New routes: GET/POST/PATCH/DELETE rental-objects and rental-bookings per hotel
- Register rentalRoutes in app.ts

Frontend:
- api.ts: add rental.listObjects, listBookings, createBooking, updateBooking, deleteBooking
- CalendarPage: fetch rental objects + bookings from API instead of mock data
- BookingCalendar: rental cell UI redesigned — colored squares + working hours + time slots (matches design spec)
- BookingCalendar: remove base rate price from desktop room label column (irrelevant with dynamic pricing)

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

src/lib/api.ts

@@ -312,6 +312,29 @@ export const api = {
       req<void>('DELETE', `/api/hotels/${slug}/guests/${id}`),
   },
 
+  // ── Rental ────────────────────────────────────────────────────────────────
+  rental: {
+    listObjects: (slug: string) =>
+      req<RentalObjectApi[]>('GET', `/api/hotels/${slug}/rental-objects`),
+
+    listBookings: (slug: string, from?: string, to?: string) => {
+      const qs = new URLSearchParams()
+      if (from) qs.set('from', from)
+      if (to)   qs.set('to', to)
+      const q = qs.toString()
+      return req<RentalBookingApi[]>('GET', `/api/hotels/${slug}/rental-bookings${q ? `?${q}` : ''}`)
+    },
+
+    createBooking: (slug: string, data: RentalBookingPayload) =>
+      req<RentalBookingApi>('POST', `/api/hotels/${slug}/rental-bookings`, data),
+
+    updateBooking: (slug: string, id: string, data: Partial<RentalBookingPayload>) =>
+      req<RentalBookingApi>('PATCH', `/api/hotels/${slug}/rental-bookings/${id}`, data),
+
+    deleteBooking: (slug: string, id: string) =>
+      req<void>('DELETE', `/api/hotels/${slug}/rental-bookings/${id}`),
+  },
+
   // ── NetUP IPTV ────────────────────────────────────────────────────────────
   netup: {
     getSettings: (slug: string) =>
@@ -515,6 +538,56 @@ export interface GuestPayload {
   rating?: number
 }
 
+export interface RentalObjectApi {
+  id: string
+  hotelId: string
+  name: string
+  icon: string
+  color: string
+  textColor: string
+  pricePerHour: number
+  pricePerDay: number
+  openHour: number
+  closeHour: number
+  maxHoursPerSlot: number | null
+  bufferMinutes: number
+  sortOrder: number
+  createdAt: string
+}
+
+export interface RentalBookingApi {
+  id: string
+  hotelId: string
+  objectId: string
+  date: string
+  isFullDay: boolean
+  startHour: number
+  endHour: number
+  guestName: string
+  guestPhone: string
+  linkedRoomId: string | null
+  totalAmount: number
+  paidAmount: number
+  status: 'confirmed' | 'cancelled'
+  notes: string | null
+  createdAt: string
+}
+
+export interface RentalBookingPayload {
+  object_id: string
+  date: string
+  is_full_day?: boolean
+  start_hour?: number
+  end_hour?: number
+  guest_name: string
+  guest_phone?: string
+  linked_room_id?: string
+  total_amount?: number
+  paid_amount?: number
+  status?: string
+  notes?: string
+}
+
 function toHotelPayload(h: HotelPayload): Record<string, unknown> {
   const out: Record<string, unknown> = {}
   if (h.name         !== undefined) out.name           = h.name