Estimate campaign cost

curl --request POST \
  --url https://api.vidjutsu.ai/v1/campaigns/estimate \
  --header 'Content-Type: application/json' \
  --data '
{
  "accountId": "<string>",
  "videoCount": 123,
  "durationDays": 123
}
'

{
  "estimatedCredits": 123,
  "breakdown": {}
}