Aggiunge heatmaps first-party (click/scroll) con pagina admin Analytics.

Raccoglie eventi aggregati dietro consenso cookie, senza PII né tracking su admin/regia/live/replay; GA4 resta invariato.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/views/layouts/marketing.html.erb

@@ -26,6 +26,7 @@
     <script src="/password-toggle.js?v=2" defer></script>
     <link rel="stylesheet" href="/confirm-forms.css?v=4">
     <script src="/confirm-forms.js?v=7" defer></script>
-    <script src="/cookie-consent.js?v=1" defer></script>
+    <script src="/site-analytics.js?v=1" defer></script>
+    <script src="/cookie-consent.js?v=2" defer></script>
   </body>
 </html>