Update Notification Preferences

curl --request PUT \
  --url https://server26-dot-royalti-project.uc.r.appspot.com/notifications/preferences \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "preferences": [
    {
      "channel": "email",
      "enabled": true
    },
    {
      "channel": "push",
      "enabled": false
    }
  ]
}'

{
  "status": "success",
  "message": "Notification preferences updated successfully",
  "data": [
    {
      "channel": "email",
      "enabled": true
    },
    {
      "channel": "push",
      "enabled": false
    },
    {
      "channel": "in_app",
      "enabled": true
    }
  ]
}