Add pricing, tariffs, loyalty, maintenance, discounts features

- TariffsPage (/tariffs): rate plan builder — meal plans (RO/BB/HB/FB/AI),
  inclusions picker, price modifier (% or ₽), min nights, cancellation policy
- DynamicPricingPage (/dynamic-pricing): rule engine for weekends, holidays,
  seasons, custom date ranges, weather; interactive price calendar preview
  with colour-coded effective rates per day
- LoyaltyPage (/loyalty): program settings (points/₽, point value, expiry),
  4-level structure (Bronze/Silver/Gold/Platinum) with editable perks,
  guest portal preview mockup, top-guests leaderboard
- MaintenancePage (/maintenance): scheduled room & service downtime records;
  status flow (scheduled → in_progress → done); time range support for services
- DiscountsPage (/discounts): discount catalogue — % or ₽, category (all /
  loyalty / corporate / promo), min nights, validity dates, active toggle
- BookingModal: discount now selected from dropdown of active discounts only
  (replaces free-form input); summary shows discount name + saved amount
- Sidebar: new "Цены и тарифы" section (Тарифы, Динамические цены, Скидки);
  Управление extended with Лояльность and Тех. перерывы

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

src/App.tsx

@@ -27,6 +27,11 @@ import { RoomCategoriesPage } from './pages/RoomCategoriesPage'
 import { DocumentsPage } from './pages/DocumentsPage'
 import { UsersPage } from './pages/UsersPage'
 import { GuestsPage } from './pages/GuestsPage'
+import { TariffsPage } from './pages/TariffsPage'
+import { DynamicPricingPage } from './pages/DynamicPricingPage'
+import { LoyaltyPage } from './pages/LoyaltyPage'
+import { MaintenancePage } from './pages/MaintenancePage'
+import { DiscountsPage } from './pages/DiscountsPage'
 
 export default function App() {
   return (
@@ -63,6 +68,11 @@ export default function App() {
                 <Route path="/documents"       element={<DocumentsPage />} />
                 <Route path="/users"           element={<UsersPage />} />
                 <Route path="/guests"          element={<GuestsPage />} />
+                <Route path="/tariffs"         element={<TariffsPage />} />
+                <Route path="/dynamic-pricing" element={<DynamicPricingPage />} />
+                <Route path="/loyalty"         element={<LoyaltyPage />} />
+                <Route path="/maintenance"     element={<MaintenancePage />} />
+                <Route path="/discounts"       element={<DiscountsPage />} />
               </Route>
 
               {/* Admin routes */}