[DEPLOY] Migrazione a subdomain nis2.certisource.it

Rimozione prefisso /nis2/ da tutti i path frontend e router:
- index.php: basePath '' (da '/nis2')
- api.js: baseUrl '/api' (da '/nis2/api')
- Tutti i file HTML: path assoluti senza prefisso /nis2/

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

public/supply-chain.html

@@ -4,7 +4,7 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Supply Chain - NIS2 Agile</title>
-    <link rel="stylesheet" href="/nis2/css/style.css">
+    <link rel="stylesheet" href="/css/style.css">
     <style>
         /* ── Supply Chain Page Styles ─────────────────────────── */
         .filters-bar {
@@ -457,10 +457,10 @@
         </main>
     </div>
 
-    <script src="/nis2/js/api.js"></script>
-    <script src="/nis2/js/common.js"></script>
-    <script src="/nis2/js/i18n.js"></script>
-    <script src="/nis2/js/help.js"></script>
+    <script src="/js/api.js"></script>
+    <script src="/js/common.js"></script>
+    <script src="/js/i18n.js"></script>
+    <script src="/js/help.js"></script>
     <script>
         // ── Auth & Init ─────────────────────────────────────────
         if (!checkAuth()) throw new Error('Not authenticated');