feat: added adsense on /free page

surfsense_web/components/ads/adsense-script.tsx

@@ -0,0 +1,27 @@
+"use client";
+
+import Script from "next/script";
+
+const ADSENSE_CLIENT_ID = process.env.NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID;
+
+/**
+ * Loads the Google AdSense library (adsbygoogle.js). Mount this once on any
+ * route that renders <AdUnit /> instances. Scoped per-route (not in the root
+ * layout) so the third-party script is not shipped on unrelated pages.
+ *
+ * Renders nothing if NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID is unset, so dev and
+ * preview deployments without the env var stay ad-free.
+ */
+export function AdSenseScript() {
+	if (!ADSENSE_CLIENT_ID) return null;
+
+	return (
+		<Script
+			id="adsbygoogle-init"
+			async
+			strategy="afterInteractive"
+			src={`https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=${ADSENSE_CLIENT_ID}`}
+			crossOrigin="anonymous"
+		/>
+	);
+}