feat: wire up loyalty + chat — register routes, API types, connect LoyaltyPage, add ChatWidget to layout

backend/src/app.ts

@@ -31,6 +31,8 @@ import uploadRoutes        from './routes/upload'
 import housekeepingSettingsRoutes from './routes/housekeeping-settings'
 import notificationsRoutes from './routes/notifications'
 import scheduleRoutes      from './routes/schedule'
+import loyaltyRoutes       from './routes/loyalty'
+import chatRoutes          from './routes/chat'
 import { startJobs } from './jobs'
 
 export async function buildApp() {
@@ -107,6 +109,8 @@ export async function buildApp() {
   await fastify.register(housekeepingSettingsRoutes)
   await fastify.register(notificationsRoutes)
   await fastify.register(scheduleRoutes)
+  await fastify.register(loyaltyRoutes)
+  await fastify.register(chatRoutes)
 
   startJobs()