feat(m11): add idle timeout auto-logout with warning dialog

web/delivery-platform-ui/src/layout/MainLayout.vue

@@ -62,11 +62,17 @@
         </div>
       </div>
     </div>
+    <el-dialog v-model="showIdleWarning" title="登录即将超时" width="400px" :close-on-click-modal="false" :show-close="false">
+      <p>您已长时间未操作，登录将在 1 分钟后超时。</p>
+      <template #footer>
+        <el-button type="primary" @click="resetIdleTimer">我还活跃</el-button>
+      </template>
+    </el-dialog>
   </div>
 </template>
 
 <script setup>
-import { computed } from "vue";
+import { computed, ref, onMounted, onUnmounted } from "vue";
 import { useRoute, useRouter } from "vue-router";
 import { useAuthStore } from "../stores/auth";
 import { ElMessage } from "element-plus";
@@ -75,6 +81,48 @@ const route = useRoute();
 const router = useRouter();
 const auth = useAuthStore();
 
+const IDLE_TIMEOUT_MS = 30 * 60 * 1000
+const WARNING_BEFORE_MS = 60 * 1000
+let idleTimer = null
+let warningTimer = null
+const showIdleWarning = ref(false)
+
+function resetIdleTimer() {
+  if (idleTimer) clearTimeout(idleTimer)
+  if (warningTimer) clearTimeout(warningTimer)
+  showIdleWarning.value = false
+
+  warningTimer = setTimeout(() => {
+    showIdleWarning.value = true
+  }, IDLE_TIMEOUT_MS - WARNING_BEFORE_MS)
+
+  idleTimer = setTimeout(() => {
+    showIdleWarning.value = false
+    ElMessage.warning('登录已超时，请重新登录')
+    auth.logout()
+    router.push({ name: 'login' })
+  }, IDLE_TIMEOUT_MS)
+}
+
+function onUserActivity() {
+  resetIdleTimer()
+}
+
+onMounted(() => {
+  window.addEventListener('mousemove', onUserActivity)
+  window.addEventListener('keydown', onUserActivity)
+  window.addEventListener('click', onUserActivity)
+  resetIdleTimer()
+})
+
+onUnmounted(() => {
+  window.removeEventListener('mousemove', onUserActivity)
+  window.removeEventListener('keydown', onUserActivity)
+  window.removeEventListener('click', onUserActivity)
+  if (idleTimer) clearTimeout(idleTimer)
+  if (warningTimer) clearTimeout(warningTimer)
+})
+
 const menuItems = [
   { path: "/", icon: "📊", label: "首页", roles: ["SYS_ADMIN","DEVELOPER","OPS"] },
   { path: "/customers", icon: "👥", label: "客户管理", roles: ["SYS_ADMIN","DEVELOPER"] },