{"service":"eCardo Agent Access","version":"1.0.0","endpoints":{"GET  /health":"health check (no auth)","GET  /":"this help","POST /exec":"execute shell command (requires X-Token)","GET  /info":"server info (requires X-Token)"},"usage":"POST /exec with header X-Token and JSON body: {\"cmd\": \"ls -la\", \"timeout\": 30, \"cwd\": \"/root\"}"}