List knowledge bases

curl --request POST \
  --url https://api.svantic.com/knowledge_base/get \
  --header 'Content-Type: application/json' \
  --data '{}'

{
  "ok": true,
  "count": 0,
  "knowledge_bases": [
    {
      "namespace": "string",
      "display_name": "string",
      "visibility": "private",
      "created_at": "2026-03-31T12:00:00.000Z"
    }
  ]
}