Initial commit: Nexus Mission Control Platform

- ASP.NET Core 10 Backend (JWT Auth, Agent config API)
- Vue 3 Frontend (Dashboard, Team, Agents, Config Editor)
- PostgreSQL Database
- Docker Compose setup
- Mission Control Dashboard redesign

frontend/src/composables/useTime.ts

@@ -0,0 +1,12 @@
+import { computed } from 'vue'
+
+export function useTime() {
+  const greeting = computed(() => {
+    const h = new Date().getHours()
+    if (h < 11) return 'Guten Morgen'
+    if (h < 18) return 'Guten Tag'
+    return 'Guten Abend'
+  })
+
+  return { greeting }
+}