Validate an invitation token

Returns whether the invitation is valid and, if so, basic user metadata for the onboarding screen.

curl -X GET "https://your-deployment.convex.site/api/invitation/validate?token=%3Cstring%3E"

{
  "valid": true,
  "email": "admin@example.com",
  "name": "Jane Admin",
  "userType": "admin"
}