fix: Tangled default domain + public-only registry API JSON
- Use tangled.org for default Tangled links and README (was tangled.sh)
- Add lib/public-profile.ts (toPublicProfileJson) for read APIs
- Strip moderation, verification workflow, and raw icon CIDs from
GET /api/registry/profile, /search, /featured; add verified boolean
- Update developer-resources API copy
Made-with: Cursor