feat: configurable bed types via BedTypesContext

- Add BedTypesContext with default types + add/remove/update operations
- Replace hardcoded BED_ITEM_TYPES array in RoomModal with useBedTypes()
- Add "Справочник спальных мест" section to RoomCategoriesPage
  (expandable, same UX as amenities: add icon+label, rename, delete)
- BedItem.type changed from union to string for dynamic support

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

src/contexts/BedTypesContext.tsx

@@ -0,0 +1,53 @@
+import { createContext, useContext, useState } from 'react'
+import type { ReactNode } from 'react'
+
+export interface BedTypeItem {
+  value: string   // unique key stored in DB (e.g. 'double', 'sofa')
+  label: string   // display name
+  icon: string    // emoji
+}
+
+const DEFAULT_BED_TYPES: BedTypeItem[] = [
+  { value: 'single', label: 'Кровать 1-сп.',  icon: '🛏' },
+  { value: 'double', label: 'Кровать 2-сп.',  icon: '🛏' },
+  { value: 'queen',  label: 'Queen-кровать',   icon: '🛏' },
+  { value: 'king',   label: 'King-кровать',    icon: '🛏' },
+  { value: 'twin',   label: 'Две кровати',     icon: '🛏' },
+  { value: 'sofa',   label: 'Диван',           icon: '🛋' },
+  { value: 'bunk',   label: 'Двухъярусная',    icon: '🛏' },
+  { value: 'cot',    label: 'Раскладушка',     icon: '🪑' },
+]
+
+interface BedTypesContextValue {
+  bedTypes: BedTypeItem[]
+  addBedType: (item: BedTypeItem) => void
+  removeBedType: (value: string) => void
+  updateBedType: (value: string, patch: Partial<Omit<BedTypeItem, 'value'>>) => void
+}
+
+const BedTypesContext = createContext<BedTypesContextValue | null>(null)
+
+export function BedTypesProvider({ children }: { children: ReactNode }) {
+  const [bedTypes, setBedTypes] = useState<BedTypeItem[]>(DEFAULT_BED_TYPES)
+
+  const addBedType = (item: BedTypeItem) =>
+    setBedTypes(prev => prev.find(b => b.value === item.value) ? prev : [...prev, item])
+
+  const removeBedType = (value: string) =>
+    setBedTypes(prev => prev.filter(b => b.value !== value))
+
+  const updateBedType = (value: string, patch: Partial<Omit<BedTypeItem, 'value'>>) =>
+    setBedTypes(prev => prev.map(b => b.value === value ? { ...b, ...patch } : b))
+
+  return (
+    <BedTypesContext.Provider value={{ bedTypes, addBedType, removeBedType, updateBedType }}>
+      {children}
+    </BedTypesContext.Provider>
+  )
+}
+
+export function useBedTypes() {
+  const ctx = useContext(BedTypesContext)
+  if (!ctx) throw new Error('useBedTypes must be used within BedTypesProvider')
+  return ctx
+}