Fix stale /etc/micronas.env path reference in setup.html

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

templates/setup.html

@@ -41,7 +41,7 @@
         </div>
     </div>
     <div class="text-center mt-3" style="font-size:.8rem; color:var(--muted)">
-        Credentials are saved hashed to <code>/etc/micronas.env</code>
+        Credentials are saved hashed to <code>/etc/micronas/micronas.env</code>
     </div>
 </div>
 </body>