Add FeedVisibility field to UpdateStreamConfig with three modes:
- public: full feed with download URLs (default)
- no-download: version info visible but download URLs stripped
- hidden: empty feed returned without a valid license key
The "no-download" mode is the key commercial pattern — customers
see updates exist (motivating purchase/renewal) but cannot download
without a valid key. Joomla shows "update available" in admin.
Applied consistently across all update feed endpoints (Joomla XML,
Dolibarr JSON, WordPress JSON) via the shared validateUpdateKey()
which now returns a stripDownloads flag.
Also: when licensing is enabled, the release listing page requires
login. Anonymous users are redirected to the login page. This
prevents browsing release notes and download links without auth.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Jonathan Miller
a149edccd3