The subscription check on plugins, connections, and usage pages was hardcoded to only look at `api_pro`. Users on scale or enterprise plans saw "Upgrade to Pro" and couldn't create plugin keys or manage connections.
Also, the check only looked at product `status` but not the `allowed` flag from autumn — so users who downgraded but were still in their billing period got locked out early.
Summary
- Migrate from consumer_pro to api_pro billing product across the app
- Enable Nova app for all users (remove feature flag)
- Add credits-based usage tracking with tokens abstraction
