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- Dark Mode: ThemeProvider (next-themes), ThemeToggle in Navbar (Hell/Dunkel/System) - Zertifikat-Tab (superadmin only): aktuelles Zertifikat anzeigen, Upload (cert+key), Self-Signed ausstellen, Let's Encrypt/ACME - Backend: /api/admin/cert/* Endpunkte (info, upload, self-signed, acme), nginx reload - HTTPS bereits live auf Server (self-signed RSA-4096, Port 443) Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>