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/stores/auth.ts

@@ -0,0 +1,32 @@
+import { defineStore } from 'pinia'
+import { ref, computed } from 'vue'
+import { apiClient } from '@/api/client'
+import { disconnectSocket } from '@/api/socket'
+
+const TOKEN_KEY = 'iu_token'
+
+export const useAuthStore = defineStore('auth', () => {
+  const token = ref<string | null>(localStorage.getItem(TOKEN_KEY))
+  const username = ref<string | null>(null)
+
+  const isAuthenticated = computed(() => token.value !== null)
+
+  async function login(user: string, password: string): Promise<void> {
+    const { data } = await apiClient.post('/api/auth/login', {
+      username: user,
+      password,
+    })
+    token.value = data.access_token
+    username.value = user
+    localStorage.setItem(TOKEN_KEY, data.access_token)
+  }
+
+  function logout(): void {
+    token.value = null
+    username.value = null
+    localStorage.removeItem(TOKEN_KEY)
+    disconnectSocket()
+  }
+
+  return { token, username, isAuthenticated, login, logout }
+})