curl --request POST \
  --url https://aarwcjjzhlmkgdwrisyt.supabase.co/functions/v1/milestone-mark-complete \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "milestone_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

{
  "success": true,
  "status": 123,
  "error": "<string>",
  "details": [
    {
      "field": "<string>",
      "message": "<string>"
    }
  ]
}