feat: hourly pricing + category base prices in booking modal + availability grid

- Add hourly_price column to rate_overrides, base_price/allow_hourly/hourly_base_price to room_categories (migration 033)
- Update categories and rate-overrides backend routes to handle new fields
- AvailabilityPage: hourly/nightly mode toggle, period prices auto-applied to grid with 'П' indicator, confirmation dialog when overriding period prices
- BookingModal: nightly/hourly toggle at top, pricing hierarchy (override → category base → room rate)
- RoomCategoriesPage: base_price/allow_hourly/hourly_base_price fields in category form; inline rooms panel
- CalendarPage + BookingCalendar: pass hourlyPriceOverrides and categoryBasePrices down to BookingModal

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

src/lib/api.ts

@@ -745,6 +745,9 @@ export interface CategoryApi {
   amenities: string[]
   photos: string[]
   sort_order: number
+  base_price: number
+  allow_hourly: boolean
+  hourly_base_price: number
   created_at: string
 }
 
@@ -755,6 +758,9 @@ export interface CategoryPayload {
   amenities?: string[]
   photos?: string[]
   sort_order?: number
+  base_price?: number
+  allow_hourly?: boolean
+  hourly_base_price?: number
 }
 
 export interface TariffApi {
@@ -794,6 +800,7 @@ export interface RateOverrideApi {
   minNights: number
   channelPrices: Record<string, number>
   closed: boolean
+  hourlyPrice?: number | null
 }
 
 export interface RateOverridePayload {
@@ -804,6 +811,7 @@ export interface RateOverridePayload {
   min_nights?: number
   channel_prices?: Record<string, number>
   closed?: boolean
+  hourly_price?: number | null
 }
 
 export interface RatePeriodApi {