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/pages/LoginPage.tsx

@@ -24,23 +24,21 @@ export function LoginPage() {
 
   if (user) {
     if (user.role === 'super_admin') return <Navigate to="/admin" replace />
-    return <Navigate to="/grand-palace/calendar" replace />
+    return <Navigate to="/calendar" replace />
   }
 
   const handleSubmit = async (e: React.FormEvent) => {
     e.preventDefault()
     setError('')
     setLoading(true)
-    const ok = await login(email, password)
+    const loggedIn = await login(email, password)
     setLoading(false)
-    if (!ok) {
+    if (!loggedIn) {
       setError('Неверный email или пароль')
       return
     }
-    // Redirect based on role
-    const user = DEMO_ACCOUNTS.find(a => a.email === email)
-    if (user?.role === 'super_admin') navigate('/admin')
-    else navigate('/grand-palace/calendar')
+    if (loggedIn.role === 'super_admin') navigate('/admin')
+    else navigate('/calendar')
   }
 
   const fillDemo = (acc: typeof DEMO_ACCOUNTS[number]) => {
@@ -105,7 +103,7 @@ export function LoginPage() {
                 <Hotel size={18} className="text-white" />
               </div>
               <span className="text-xl font-bold text-slate-900 dark:text-slate-100">
-                Hotel<span className="text-brand-600">Next</span>
+                Hotel<span className="text-brand-600">Sync</span>
               </span>
             </div>