feat: TTLock integration + fix agent offline status

- Add TTLock electronic lock module: settings page, room-lock mapping,
  card issuance via agent command (ttlock:write_card)
- Fix agent offline: EquipmentPage now polls every 30s + reacts to
  workstation:online/offline WebSocket events instantly
- Backend broadcasts workstation online/offline events to hotel clients
  via existing WebSocket (agent-ws.ts)
- New DB migration 048_ttlock.sql: hotel_ttlock_config, room_lock_mappings,
  card_issuances tables
- New backend routes: GET/PATCH ttlock/config, POST ttlock/token,
  GET ttlock/locks, POST/DELETE ttlock/room-locks, POST issue-card
- "Выдать ключ (TTLock)" button in BookingDetailPanel for confirmed/checked_in
- TTLock page added to sidebar under Настройки

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

src/App.tsx

@@ -43,6 +43,7 @@ import { SchedulePage } from './pages/SchedulePage'
 import { BillingPage } from './pages/BillingPage'
 import { EquipmentPage } from './pages/EquipmentPage'
 import { WiFiPage } from './pages/WiFiPage'
+import { TTLockPage } from './pages/TTLockPage'
 import { ModuleGuard } from './components/ModuleGuard'
 
 export default function App() {
@@ -96,6 +97,7 @@ export default function App() {
                 <Route path="/billing"        element={<BillingPage />} />
                 <Route path="/equipment"      element={<EquipmentPage />} />
                 <Route path="/wifi"           element={<WiFiPage />} />
+                <Route path="/ttlock"         element={<TTLockPage />} />
               </Route>
 
               <Route path="/" element={<Navigate to="/login" replace />} />