feat: Graphify build worker endpoints + UI trigger

- POST /api/aos/instances/[id]/graph-build: trigger or get build command
- POST /api/aos/instances/[id]/graph-status: worker callback (ok/error)
- GET /api/aos/graphify-health: check if Graphify service is up
- Instance detail: 'Graph neu erstellen' button (visible when demo_active/active)
- Graceful degradation: if GRAPHIFY_URL not set, returns build command for external worker

src/components/aos/views/instances.tsx

@@ -19,6 +19,7 @@ import {
   CheckCircle2,
   XCircle,
   CircleDashed,
+  Network,
 } from 'lucide-react'
 import { useFetch } from '@/hooks/use-fetch'
 import { Card } from '@/components/ui/card'
@@ -898,15 +899,57 @@ function InstanceDetailSheet({
                     </Button>
                   </div>
                 ) : (
-                  <ActionsRow
-                    status={status}
-                    busyAction={busyAction}
-                    onSuspend={() => handleAction('suspend', 'Suspendieren')}
-                    onReactivate={() => handleAction('reactivate', 'Reaktivieren')}
-                    onExtend={() => handleAction('extend', 'Demo verlängern', 7)}
-                    onRetry={() => handleAction('retry', 'Provisioning wiederholen')}
-                    onDelete={() => setConfirmingDelete(true)}
-                  />
+                  <>
+                    <ActionsRow
+                      status={status}
+                      busyAction={busyAction}
+                      onSuspend={() => handleAction('suspend', 'Suspendieren')}
+                      onReactivate={() => handleAction('reactivate', 'Reaktivieren')}
+                      onExtend={() => handleAction('extend', 'Demo verlängern', 7)}
+                      onRetry={() => handleAction('retry', 'Provisioning wiederholen')}
+                      onDelete={() => setConfirmingDelete(true)}
+                    />
+                    {['demo_active', 'active'].includes(status) && (
+                      <Button
+                        variant="outline"
+                        size="sm"
+                        className="w-full gap-1.5"
+                        disabled={busyAction !== null}
+                        onClick={async () => {
+                          setBusyAction('graph-build')
+                          const t = toast.loading('Graphify-Graph wird erstellt…')
+                          try {
+                            const r = await fetch(`/api/aos/instances/${instance.id}/graph-build`, { method: 'POST' })
+                            const res = await r.json()
+                            if (!r.ok) throw new Error(res.error || 'build failed')
+                            if (res.status === 'queued') {
+                              toast.info('Graphify nicht konfiguriert — Build-Kommando generiert.', {
+                                id: t,
+                                description: 'Worker muss den Build ausführen.',
+                                duration: 6000,
+                              })
+                            } else if (res.status === 'command-ready') {
+                              toast.success('Graphify-Service erreichbar. Build-Kommando bereit.', {
+                                id: t,
+                                description: 'Worker führt den Build aus.',
+                                duration: 6000,
+                              })
+                            } else {
+                              toast.success('Graph-Build gestartet', { id: t })
+                            }
+                            refetch()
+                          } catch (err) {
+                            toast.error(err instanceof Error ? err.message : 'Build fehlgeschlagen', { id: t })
+                          } finally {
+                            setBusyAction(null)
+                          }
+                        }}
+                      >
+                        <Network className="size-3.5" />
+                        Graph neu erstellen
+                      </Button>
+                    )}
+                  </>
                 )}
               </section>
             </div>