List user guilds

curl --request POST \
  --url https://api.fluxer.app/v1/admin/users/list-guilds \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "user_id": "<string>",
  "before": "<string>",
  "after": "<string>",
  "limit": 100,
  "with_counts": true
}
'

{
  "guilds": [
    {
      "id": "<string>",
      "name": "<string>",
      "features": [
        "<string>"
      ],
      "owner_id": "<string>",
      "icon": "<string>",
      "banner": "<string>",
      "member_count": 1073741823
    }
  ]
}