{"message":"JNPA Digital Twin Backend","version":"0.2.0","docs":"/docs","redoc":"/redoc","new_endpoints":["GET /dukc/{vessel_id} — RTUKC analysis","GET /dukc — RTUKC matrix all vessels","GET /jit/{vessel_id} — JIT approach window","GET /jit — JIT fleet overview","GET /reports/marine — Marine KPI reports (CSV/JSON)"]}