- Add /api/abs-proxy/* endpoint in the backend that forwards all ABS API
calls server-side (X-ABS-URL + X-ABS-Token headers). Browser never
touches ABS directly for API calls — no CORS issue.
- abs.js routes through proxy when backendUrl is set; falls back to direct
if no backend (requires user to configure CORS on ABS server)
- Audio streaming still uses direct <audio src> (HTML media bypasses CORS)
- Settings: status text above buttons, buttons full-width flex row
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- Replace username/password login with API key (Bearer token) auth
- New absVerifyApiKey() verifies via GET /api/me instead of POST /login
- Settings shows single API Key field with hint (Profil → API Token in ABS)
- API key never pre-filled in settings for security
- Add "Bücher" button to mobile bottom-nav (bnav-library), hidden until connected
- _showAbsNavItem() helper keeps sidebar + bnav in sync on connect/disconnect
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>