curl --request POST \
  --url https://synthesis.trade/api/v1/project/account/{account_id}/session \
  --header 'X-PROJECT-API-KEY: <api-key>'

{
  "success": true,
  "response": {
    "account_id": "...",
    "session_id": "...",
    "created_at": "2026-01-01T00:00:00",
    "expires_at": "2026-01-08T00:00:00"
  }
}