feat: staff work schedule — weekly grid for all roles, shift assignment, day off marking

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

backend/src/app.ts

@@ -30,6 +30,7 @@ import rateOverridesRoutes from './routes/rate-overrides'
 import uploadRoutes        from './routes/upload'
 import housekeepingSettingsRoutes from './routes/housekeeping-settings'
 import notificationsRoutes from './routes/notifications'
+import scheduleRoutes      from './routes/schedule'
 import { startJobs } from './jobs'
 
 export async function buildApp() {
@@ -105,6 +106,7 @@ export async function buildApp() {
   await fastify.register(uploadRoutes)
   await fastify.register(housekeepingSettingsRoutes)
   await fastify.register(notificationsRoutes)
+  await fastify.register(scheduleRoutes)
 
   startJobs()