Werkstatt: ServicesCard-Neustart-Bug fixieren

Das Frontend schickte den Anzeigenamen (z.B. 'Engine (llama-swap)')
an die Restart-API, die aber systemd-Unit-Namen (z.B. 'llama-swap')
erwartet. Backend gibt jetzt ein 'unit'-Feld mit; Frontend nutzt es
für restart(), disabled und key.

frontend/src/components/dashboard/ServicesCard.tsx

@@ -43,7 +43,7 @@ export function ServicesCard() {
         <div className="flex flex-1 flex-col">
           <div className="space-y-1.5">
             {svc.services.map((x) => (
-              <div key={x.name} className="group flex items-center justify-between gap-2 rounded-xl border border-border/30 bg-background/20 p-2.5">
+              <div key={x.unit} className="group flex items-center justify-between gap-2 rounded-xl border border-border/30 bg-background/20 p-2.5">
                 <div className="flex min-w-0 items-center gap-2">
                   <span className={cn("h-2.5 w-2.5 shrink-0 rounded-full ring-2 ring-black/40", x.ok ? "bg-emerald-500" : "bg-amber-500")} />
                   <div className="min-w-0">
@@ -52,11 +52,11 @@ export function ServicesCard() {
                   </div>
                 </div>
                 <button
-                  onClick={() => restart(x.name)} disabled={restarting[x.name]}
+                  onClick={() => restart(x.unit)} disabled={restarting[x.unit]}
                   className="flex h-7 w-7 shrink-0 items-center justify-center rounded-lg border border-border/40 text-muted-foreground opacity-0 transition-all hover:bg-primary/5 hover:text-primary group-hover:opacity-100"
                   title="Dienst neu starten"
                 >
-                  <RefreshCw className={cn("h-3.5 w-3.5", restarting[x.name] && "animate-spin")} />
+                  <RefreshCw className={cn("h-3.5 w-3.5", restarting[x.unit] && "animate-spin")} />
                 </button>
               </div>
             ))}