Get user instances

curl --request GET \
  --url https://api.klavis.ai/user/instances \
  --header 'Authorization: Bearer <token>'

{
  "instances": [
    {
      "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "name": "<string>",
      "description": "<string>",
      "tools": [
        {
          "name": "<string>",
          "description": "<string>"
        }
      ],
      "authNeeded": true,
      "isAuthenticated": false
    }
  ]
}