Get current account (lazy-creates if needed)

{
  "id": "string",
  "email": "user@example.com",
  "displayName": "string",
  "firstName": "string",
  "lastName": "string",
  "organisationName": "string",
  "country": "string",
  "language": "string",
  "auctionSystem": {
    "id": "string",
    "identifier": "string",
    "labels": {
      "property1": "string",
      "property2": "string"
    },
    "sortOrder": 0
  },
  "isActive": true,
  "role": "string",
  "isOrganisation": true,
  "showEmailPublicly": true,
  "avatarUrl": "string",
  "createdAt": "string",
  "updatedAt": "string"
}