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

internal/api/v1/handlers.go

@@ -550,6 +550,20 @@ func getDaemonStatus() map[string]map[string]any {
 	}
 	result["nftables"] = nftEntry
 
+	// certbot is a CLI tool, not a daemon — check if installed
+	certbotEntry := map[string]any{"active": false}
+	if _, err := exec.LookPath("certbot"); err == nil {
+		certbotEntry["active"] = true
+		if out, verErr := exec.Command("certbot", "--version").Output(); verErr == nil {
+			// "certbot 2.11.0"
+			s := strings.TrimSpace(string(out))
+			if _, after, found := strings.Cut(s, " "); found {
+				certbotEntry["version"] = after
+			}
+		}
+	}
+	result["certbot"] = certbotEntry
+
 	return result
 }
 

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 (

web/src/components/DashboardComponent.tsx

@@ -8,7 +8,7 @@ import { Badge } from './ui/badge';
 import {
   LayoutDashboard, Cloud, CheckCircle, XCircle, AlertCircle, Loader2,
   BookOpen, Globe, Router, RotateCw, Key, KeyRound,
-  Shield, Eye, ArrowLeftRight, Lock,
+  Shield, ShieldCheck, Eye, ArrowLeftRight, Lock,
 } from 'lucide-react';
 import { useCloudflare } from '../hooks/useCloudflare';
 import { useCentralStatus } from '../hooks/useCentralStatus';
@@ -23,6 +23,7 @@ const SERVICES = [
   { key: 'wireguard', label: 'VPN', icon: Lock },
   { key: 'crowdsec', label: 'CrowdSec', icon: Eye },
   { key: 'authelia', label: 'Auth', icon: KeyRound },
+  { key: 'certbot', label: 'Certificates', icon: ShieldCheck },
 ];
 
 function formatUptime(totalSeconds: number): string {