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/WebsitePage.tsx

@@ -0,0 +1,65 @@
+import { Globe, Layout, Paintbrush, Eye, Smartphone, Lock } from 'lucide-react'
+
+export function WebsitePage() {
+  return (
+    <div className="p-6 max-w-4xl mx-auto space-y-6">
+      <div className="flex items-center gap-3">
+        <div className="w-10 h-10 rounded-xl bg-rose-500 flex items-center justify-center shrink-0">
+          <Globe size={20} className="text-white" />
+        </div>
+        <div>
+          <h1 className="text-xl font-bold text-slate-900 dark:text-slate-100">Конструктор сайта</h1>
+          <p className="text-sm text-slate-500 dark:text-slate-400">Создайте сайт отеля без разработчика</p>
+        </div>
+      </div>
+
+      {/* Placeholder preview */}
+      <div className="bg-white dark:bg-slate-800 rounded-2xl border border-slate-200 dark:border-slate-700 overflow-hidden">
+        <div className="bg-slate-100 dark:bg-slate-700 px-4 py-3 flex items-center gap-3 border-b border-slate-200 dark:border-slate-600">
+          <div className="flex gap-1.5">
+            <div className="w-3 h-3 rounded-full bg-red-400" />
+            <div className="w-3 h-3 rounded-full bg-amber-400" />
+            <div className="w-3 h-3 rounded-full bg-emerald-400" />
+          </div>
+          <div className="flex-1 bg-white dark:bg-slate-600 rounded-md px-3 py-1 text-xs text-slate-400">
+            grand-palace.hotelsync.ru
+          </div>
+        </div>
+        <div className="p-8 text-center space-y-4">
+          <div className="w-16 h-16 rounded-2xl bg-rose-100 dark:bg-rose-900/30 flex items-center justify-center mx-auto">
+            <Paintbrush size={28} className="text-rose-500" />
+          </div>
+          <h3 className="text-lg font-semibold text-slate-900 dark:text-slate-100">
+            Редактор сайта
+          </h3>
+          <p className="text-sm text-slate-500 dark:text-slate-400 max-w-sm mx-auto">
+            Визуальный редактор откроется здесь. Выберите шаблон, настройте цвета, загрузите фото номеров и опубликуйте сайт за 30 минут.
+          </p>
+          <div className="flex items-center justify-center gap-3 flex-wrap">
+            <button className="btn-primary flex items-center gap-2">
+              <Layout size={15} /> Выбрать шаблон
+            </button>
+            <button className="btn-secondary flex items-center gap-2">
+              <Eye size={15} /> Предпросмотр
+            </button>
+          </div>
+        </div>
+      </div>
+
+      {/* Features list */}
+      <div className="grid grid-cols-1 sm:grid-cols-3 gap-3">
+        {[
+          { icon: Paintbrush,  title: 'Drag & Drop',     desc: 'Редактор без кода' },
+          { icon: Smartphone,  title: 'Адаптивный',      desc: 'Mobile-first дизайн' },
+          { icon: Lock,        title: 'SSL & домен',      desc: 'Бесплатный сертификат' },
+        ].map(f => (
+          <div key={f.title} className="bg-white dark:bg-slate-800 rounded-xl border border-slate-200 dark:border-slate-700 p-4 text-center">
+            <f.icon size={22} className="text-rose-500 mx-auto mb-2" />
+            <p className="font-medium text-slate-900 dark:text-slate-100 text-sm">{f.title}</p>
+            <p className="text-xs text-slate-400 mt-0.5">{f.desc}</p>
+          </div>
+        ))}
+      </div>
+    </div>
+  )
+}