feat: Add footer with legal links (Impressum, Datenschutz, Einstellungen)

src/app/page.tsx

@@ -280,6 +280,17 @@ export default function Home() {
                 </div>
             </div>
 
+            {/* Footer */}
+            <footer className="pb-28 pt-8 text-center">
+                <div className="flex justify-center gap-4 text-xs text-zinc-600">
+                    <a href="/impressum" className="hover:text-orange-500 transition-colors">Impressum</a>
+                    <span>•</span>
+                    <a href="/privacy" className="hover:text-orange-500 transition-colors">Datenschutz</a>
+                    <span>•</span>
+                    <a href="/settings" className="hover:text-orange-500 transition-colors">Einstellungen</a>
+                </div>
+            </footer>
+
             <BottomNavigation
                 onScan={handleImageSelected}
                 onHome={() => window.scrollTo({ top: 0, behavior: 'smooth' })}