Hub-and-Spoke Umbau: Multi-Tenant Zentrale + Satellite-Agent

- Backend: Customer/Satellite Models, customer_id auf Server/Job/Audit
- Satellite-API: heartbeat, poll (atomares Claiming), logs, result,
  scan-result, health-report - Auth via X-Api-Key (SHA-256 gehasht)
- Job-Queue: pending/claimed/running/success/failed + Stale-Janitor
- Batch-Trigger: ein Job pro Server, Satellite arbeitet sequenziell ab
- Credentials bleiben lokal: nur symbolische credential_ref zentral
- Neues Paket satellite/: Pull-Loop, WinRM/SSH/CAU/Scanner, PyInstaller-tauglich
- Frontend: Kunden-Switcher, Satelliten-View, Polling statt WebSocket
- Entfernt: WebSocket/Socket.io, Redis, zentrale Credentials, JobRunner
- Docs: README/AGENTS/PROMPT auf neue Architektur aktualisiert

frontend/src/router/index.ts

@@ -14,6 +14,16 @@ const router = createRouter({
       name: 'dashboard',
       component: () => import('@/views/DashboardView.vue'),
     },
+    {
+      path: '/customers',
+      name: 'customers',
+      component: () => import('@/views/CustomersView.vue'),
+    },
+    {
+      path: '/satellites',
+      name: 'satellites',
+      component: () => import('@/views/SatellitesView.vue'),
+    },
     {
       path: '/servers',
       name: 'servers',