Add Availability Calendar, Modules system, and route refactoring

- Add AvailabilityPage with price grid (categories × dates), drag-select,
  channel prices, EditPanel, PeriodModal, and rate periods tab
- Add ModulesContext with localStorage persistence and dynamic sidebar items
- Add ModulesPage with WiFi Auth, Payments, TV Welcome, Smart Locks,
  OLAP Reports, Website Builder, Booking Widget modules
- Add ReportsPage (OLAP analytics with KPI cards, charts, tables)
- Add WebsitePage and BookingWidgetPage placeholders
- Remove hotel slug from URL routing; hotel context from JWT
- Add Доступность nav item in Sidebar under Управление
- Fix LoginPage redirects and HotelSync branding

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

src/contexts/ModulesContext.tsx

@@ -0,0 +1,54 @@
+import { createContext, useContext, useState } from 'react'
+import type { ModuleStatus } from '../data/modulesData'
+
+// Default statuses for demo
+const DEFAULT_STATUSES: Record<string, ModuleStatus> = {
+  'wifi-auth':      'active',
+  'payments':       'trial',
+  'tv-welcome':     'inactive',
+  'smart-locks':    'inactive',
+  'olap-reports':   'active',   // active в демо — виден в сайдбаре
+  'website-builder':'inactive',
+  'booking-widget': 'inactive',
+}
+
+interface ModulesContextValue {
+  statuses: Record<string, ModuleStatus>
+  setStatus: (id: string, status: ModuleStatus) => void
+  isActive: (id: string) => boolean
+}
+
+const ModulesContext = createContext<ModulesContextValue | null>(null)
+
+export function ModulesProvider({ children }: { children: React.ReactNode }) {
+  const [statuses, setStatuses] = useState<Record<string, ModuleStatus>>(() => {
+    try {
+      const stored = localStorage.getItem('hotelsync-modules')
+      return stored ? { ...DEFAULT_STATUSES, ...JSON.parse(stored) } : DEFAULT_STATUSES
+    } catch {
+      return DEFAULT_STATUSES
+    }
+  })
+
+  const setStatus = (id: string, status: ModuleStatus) => {
+    setStatuses(prev => {
+      const next = { ...prev, [id]: status }
+      localStorage.setItem('hotelsync-modules', JSON.stringify(next))
+      return next
+    })
+  }
+
+  const isActive = (id: string) => statuses[id] === 'active' || statuses[id] === 'trial'
+
+  return (
+    <ModulesContext.Provider value={{ statuses, setStatus, isActive }}>
+      {children}
+    </ModulesContext.Provider>
+  )
+}
+
+export function useModules() {
+  const ctx = useContext(ModulesContext)
+  if (!ctx) throw new Error('useModules must be used within ModulesProvider')
+  return ctx
+}