Initial scaffold: FastAPI backend + Vue 3 frontend + Docker setup

Backend: config/db/security/logging core, SQLAlchemy models (Server,
Credential, UpdateJob, UpdateLog, AuditLog, User), services (winrm, ssh,
cau, audit, job_runner), REST API (auth, servers, updates, audit),
Socket.io WebSocket layer.
Frontend: Vue 3 + TS + Pinia + Tailwind, Views (Dashboard, Servers,
Updates, Audit, Login), axios + socket.io-client, nginx prod config.

frontend/src/App.vue

@@ -0,0 +1,15 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import { useRoute } from 'vue-router'
+import AppLayout from '@/components/AppLayout.vue'
+
+const route = useRoute()
+const isLogin = computed(() => route.name === 'login')
+</script>
+
+<template>
+  <router-view v-if="isLogin" />
+  <AppLayout v-else>
+    <router-view />
+  </AppLayout>
+</template>