Create audience with CSV upload

curl --request POST \
  --url https://atoms-api.smallest.ai/api/v1/audience \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: multipart/form-data' \
  --form name=test_audience \
  --form 'description=List of customers for marketing campaign' \
  --form phoneNumberColumnName=phoneNumber \
  --form identifierColumnName=Name

{
  "status": true,
  "data": {
    "_id": "60d0fe4f5311236168a109ca",
    "name": "My Customer List",
    "description": "List of customers for marketing campaign",
    "phoneNumberColumnName": "phoneNumber",
    "identifierColumnName": "Name",
    "organization": "60d0fe4f5311236168a109cb",
    "createdBy": "60d0fe4f5311236168a109cc",
    "createdAt": "2025-01-15T10:30:00.000Z",
    "updatedAt": "2025-01-15T10:30:00.000Z"
  }
}