curl --request POST \
  --url https://api.leanmcp.com/api/chat-messages \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "chatId": "c1a83d84-7154-464c-bd19-a9f10e0a067f",
  "role": "system",
  "content": "<string>",
  "id": "abc123-def456-789-ghi-012345678901",
  "messageIndex": 0,
  "metadata": {},
  "fileIds": [
    "f1a83d84-7154-464c-bd19-a9f10e0a067f",
    "f2b94e95-8265-575d-ce2a-b0f21f1b178g"
  ]
}
'

{
  "id": "<string>",
  "chatId": "c1a83d84-7154-464c-bd19-a9f10e0a067f",
  "userId": "<string>",
  "role": "system",
  "content": "<string>",
  "messageIndex": 1,
  "createdAt": "<string>",
  "updatedAt": "<string>",
  "metadata": {}
}