- Add feed-discovery.js utility that discovers RSS/Atom/JSON feeds from website URLs
- Add /api/discover endpoint for frontend feed discovery
- Update blog edit form with discovery UI (enter website URL, discover feeds)
- Auto-populate feedUrl, title, and siteUrl from discovery results
- Handle multiple feed options (let user choose)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>