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>

backend/src/app.ts

@@ -37,6 +37,7 @@ import chatRoutes          from './routes/chat'
 import workstationRoutes   from './routes/workstations'
 import agentReleaseRoutes  from './routes/agent-release'
 import wifiSettingsRoutes, { wifiAuthVerify } from './routes/wifi-settings'
+import ttlockRoutes from './routes/ttlock'
 import { setupAgentWsRoute } from './agent-ws'
 import { startJobs } from './jobs'
 
@@ -126,6 +127,7 @@ export async function buildApp() {
   await fastify.register(agentReleaseRoutes)
   await fastify.register(wifiSettingsRoutes)
   await fastify.register(wifiAuthVerify)
+  await fastify.register(ttlockRoutes)
   await fastify.register(setupAgentWsRoute)
 
   startJobs()