feat: implement author pages, app layout, and authentication client infrastructure

src/app/(marketing-de)/layout.tsx

@@ -13,13 +13,13 @@ export const metadata: Metadata = {
     },
     description: 'Erstellen Sie dynamische QR Codes für Feedback, PDF, Coupons und App Stores. Verfolgen Sie Scans und skalieren Sie Kampagnen mit sicheren Analysen.',
     metadataBase: new URL('https://www.qrmaster.net'),
-    icons: {
-        icon: [
-            { url: '/favicon.svg', type: 'image/svg+xml' },
-            { url: '/logo.svg', type: 'image/svg+xml' },
-        ],
-        apple: '/logo.svg',
-    },
+    icons: {
+        icon: [
+            { url: '/favicon1.png', sizes: '2048x2048', type: 'image/png' },
+        ],
+        shortcut: '/favicon1.png',
+        apple: '/favicon1.png',
+    },
     openGraph: {
         type: 'website',
         siteName: 'QR Master',