feat: deposit module — QR flow, PayDepositPage, BookingDetailPanel widget

- Backend: GET /api/pay/:slug (public) — returns active hold confirmation URL
- PayDepositPage: public page /:slug/pay for guests (no login required)
- DepositSettingsPage: QR code section with print button
- BookingDetailPanel: DepositWidget in payment tab
  - Наличными / ЮКасса (QR) buttons
  - hold_created: copy link + refresh
  - hold_confirmed: release form (вернуть / списать)
  - Final status badges

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

src/App.tsx

@@ -47,6 +47,7 @@ import { TTLockPage } from './pages/TTLockPage'
 import { ChecklistSettingsPage } from './pages/ChecklistSettingsPage'
 import { MinibarSettingsPage } from './pages/MinibarSettingsPage'
 import { DepositSettingsPage } from './pages/DepositSettingsPage'
+import { PayDepositPage } from './pages/PayDepositPage'
 import { ModuleGuard } from './components/ModuleGuard'
 
 export default function App() {
@@ -64,6 +65,7 @@ export default function App() {
               <Route path="/reset-password"    element={<ResetPasswordPage />} />
               <Route path="/review/:slug"       element={<GuestReviewPage />} />
               <Route path="/room-service/:slug" element={<GuestRoomServicePage />} />
+              <Route path="/:slug/pay"          element={<PayDepositPage />} />
 
               {/* PMS routes */}
               <Route element={<AppLayout />}>