Health Check

{
  "status": "healthy",
  "service": "hotel-search-discovery-engine",
  "version": "2.0.0",
  "timestamp": "2026-01-29T12:00:00Z",
  "dependencies": {
    "opensearch": "connected",
    "postgresql": "connected",
    "redis": "connected",
    "kafka": { ... }
  }
}