- Replace all user-visible Sub2API brand names with FireflyAPI
- Remove GitHub navigation link from AppHeader dropdown
- Remove GitHub link from HomeView footer
- Simplify VersionBadge to static version display (remove update check)
- Update i18n zh/en locale strings
- Update default site name fallbacks across all views
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>