Create organization during OAuth onboarding

curl --request POST \
  --url https://app.usechar.ai/api/oauth/create-org \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "session": "<string>",
  "csrf_token": "<string>",
  "name": "<string>"
}
'

{
  "user": {
    "email": "<string>",
    "name": "<string>",
    "organizationName": "<string>"
  },
  "domains": [
    "<string>"
  ],
  "csrfToken": "<string>",
  "needsOrgCreation": true,
  "suggestedOrgName": "<string>",
  "warning": "<string>"
}