style: Move VPN above Firewall in sidebar

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

web/src/components/AppSidebar.tsx

@@ -58,8 +58,8 @@ export function AppSidebar() {
   ];
 
   const centralItems = [
-    { to: '/central/firewall', icon: Shield, label: 'Firewall' },
     { to: '/central/vpn', icon: Lock, label: 'VPN' },
+    { to: '/central/firewall', icon: Shield, label: 'Firewall' },
     { to: '/central/crowdsec', icon: ShieldAlert, label: 'CrowdSec' },
     { to: '/central/dhcp', icon: Wifi, label: 'DHCP' },
   ];