Change stats fetch interval from 500ms to 2 seconds

Reduces the frequency of stats API calls from twice per second
to once every 2 seconds, reducing server load.

internal/templates/status.html

@@ -382,9 +382,9 @@
                 });
         }
         
-        // Update immediately and then every 500ms
+        // Update immediately and then every 2 seconds
         updateStatus();
-        setInterval(updateStatus, 500);
+        setInterval(updateStatus, 2000);
     </script>
 </body>
 </html>