curl --request GET \
  --url http://localhost:8080/cabinet/admin/stats/referrals/top

{
  "by_earnings": [
    {
      "user_id": 123,
      "display_name": "<string>",
      "invited_count": 123,
      "telegram_id": 123,
      "email": "<string>",
      "username": "<string>",
      "invited_today": 0,
      "invited_week": 0,
      "invited_month": 0,
      "earnings_today_kopeks": 0,
      "earnings_week_kopeks": 0,
      "earnings_month_kopeks": 0,
      "earnings_total_kopeks": 0
    }
  ],
  "by_invited": [
    {
      "user_id": 123,
      "display_name": "<string>",
      "invited_count": 123,
      "telegram_id": 123,
      "email": "<string>",
      "username": "<string>",
      "invited_today": 0,
      "invited_week": 0,
      "invited_month": 0,
      "earnings_today_kopeks": 0,
      "earnings_week_kopeks": 0,
      "earnings_month_kopeks": 0,
      "earnings_total_kopeks": 0
    }
  ],
  "total_referrers": 123,
  "total_referrals": 123,
  "total_earnings_kopeks": 123
}