{"service":"QNFO Knowledge Graph API","version":"1.0","endpoints":["GET  /health","GET  /stats","GET  /projects","GET  /nodes?label=X&search=Y","GET  /nodes/:id","GET  /neighbors/:id","GET  /edges?type=X&source=Y&target=Z","POST /query  {query, params}","GET  /impact/:nodeName","POST /sync   {nodes, edges} — bulk upsert/delete"]}