List variables

curl -X GET "https://api.nevia.cloud/v1/variables?workspace=01d4cnjjq40hnnh0nwmkg35nv2h" \
  -H "Authorization: Bearer $TOKEN"

{
  "variables": [
    {
      "id": "01d4cnjr0f5h7k9m2p4r6t8v0x2",
      "workspace": "01d4cnjjq40hnnh0nwmkg35nv2h",
      "name": "DATABASE_PASSWORD",
      "created_by": "01d4cnjmn4fbb1r5btxb5mypv62",
      "updated_by": "01d4cnjmn4fbb1r5btxb5mypv62",
      "created_at": "2026-09-10T12:34:56Z",
      "updated_at": "2026-09-10T12:34:56Z",
      "deleted_at": "2026-09-10T12:34:56Z"
    }
  ],
  "next_cursor": "string",
  "has_more": true
}