Add certbot status to dashboard services and sidebar nav indicator

- Add certbot to getDaemonStatus: checks binary availability and version
- Dashboard: add Certificates card to services grid
- Sidebar: show green/red status dot for certbot on Certificates nav item

web/src/components/AppSidebar.tsx

@@ -105,7 +105,7 @@ export function AppSidebar() {
     { to: '/advanced/crowdsec', icon: ShieldAlert, label: 'CrowdSec', daemon: 'crowdsec' as const },
     { to: '/advanced/authelia', icon: KeyRound, label: 'Authelia', daemon: 'authelia' as const },
     { to: '/advanced/ddns', icon: Globe, label: 'DDNS', daemon: undefined },
-    { to: '/advanced/certificates', icon: ShieldCheck, label: 'Certificates', daemon: undefined },
+    { to: '/advanced/certificates', icon: ShieldCheck, label: 'Certificates', daemon: 'certbot' as const },
   ];
 
   return (