Add GDPR consent message for EU visitors and ensure ad publisher ID is correctly configured

Implement GDPR funding choices script in index.html to display consent messages for EU visitors and verify the correct AdSense publisher ID is used across ad scripts.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 517dfa7b-26ac-463d-a6e1-a58c6df97188
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: a85590f0-6480-4424-8678-0ba0e9790619
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/f209e72a-0939-48fa-84fc-57854de71967/517dfa7b-26ac-463d-a6e1-a58c6df97188/ls5p9ni
Replit-Helium-Checkpoint-Created: true

client/index.html

@@ -9,6 +9,8 @@
     <meta property="og:description" content="Aktuelle Nachrichten aus der Welt der Volksmusik und des Schlagers." />
     <meta property="og:type" content="website" />
     <link rel="icon" type="image/png" href="/favicon.png" />
+    <script async src="https://fundingchoicesmessages.google.com/i/pub-4465464714854276?ers=1" nonce=""></script>
+    <script nonce="">(function() {function signalGooglefcPresent() {if (!window.frames['googlefcPresent']) {if (document.body) {const iframe = document.createElement('iframe'); iframe.style = 'width: 0; height: 0; border: none; z-index: -1000; left: -1000px; top: -1000px;'; iframe.style.display = 'none'; iframe.name = 'googlefcPresent'; iframe.id = 'googlefcPresent'; document.body.appendChild(iframe);} else {setTimeout(signalGooglefcPresent, 0);}}}signalGooglefcPresent();})();</script>
     <script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-4465464714854276" crossorigin="anonymous"></script>
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>