fix(health): suppress 404 when health monitor disabled + fix audit test assertion

- Sidebar.svelte: defer healthStore.refresh() until feature flags confirm
  health_monitor is enabled; skip entirely when disabled
- health.js: remove throw error from catch block — log and return null
  instead, preventing 'Uncaught (in promise)' on expected 404
- test_report_audit_immutability.py: fix mock assertions —
  audit_service uses logger.reason/reflect/explore, not logger.info
- HealthStore and Sidebar now produce zero network noise when
  FEATURES__HEALTH_MONITOR=false

docker-compose.yml

@@ -53,7 +53,7 @@ services:
     depends_on:
       - backend
     ports:
-      - "${FRONTEND_HOST_PORT:-8000}:80"
+      - "8100:80"
 
 volumes:
   postgres_data: