POST Créer une campagne

POST /api/v1/campaigns

{
  "data": {
    "id": "cmp_uuid",
    "status": "scheduled",
    "stats": {
      "planned": 0,
      "queued": 0,
      "sent": 0,
      "delivered": 0,
      "read": 0,
      "failed": 0,
      "cancelled": 0
    }
  }
}