Demote User

POST /api/roblox/demote

curl -X POST https://api.rankgun.works/api/roblox/demote \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "userId": 123456789,
    "reason": "Inactive for 30 days"
  }'

{
  "success": true,
  "oldRank": 20,
  "newRank": 10,
  "username": "Builderman"
}