perf(admin): 实现切页即时导航与列表 loading 壳

非阻塞 session 刷新、侧边栏 chunk 预取、KeepAlive 对齐，以及按 tab 延迟加载重型列表页。

apps/admin/src/router/index.ts

@@ -1,7 +1,7 @@
 import { createRouter, createWebHistory } from 'vue-router';
 import { useAuthStore } from '../stores/auth';
 import { useSmokeTestsAllowed } from '../composables/useSmokeTestsAllowed';
-import { ensureStaffSession, isSessionFresh } from '../utils/session-hydrate';
+import { hydrateStaffSession } from '../utils/session-hydrate';
 import { reconcileStaffSessionFromToken } from '../stores/auth';
 import { AdminPerm } from '../constants/permissions';
 import { adminCanAccess, firstAdminFallback } from '../utils/admin-access';
@@ -192,13 +192,9 @@ router.beforeEach(async (to) => {
   const hasToken = !!auth.token.value;
 
   if (hasToken) {
-    if (isSessionFresh()) {
-      // Session 在 TTL 内且完整：只做同步 reconcile，跳过网络请求
-      reconcileStaffSessionFromToken();
-    } else {
-      // Session 过期或不完整：才 await 远程刷新
-      await ensureStaffSession();
-    }
+    reconcileStaffSessionFromToken();
+    // 后台刷新 session，不阻塞路由切换；401 由 api 拦截器处理
+    void hydrateStaffSession();
   }
 
   const hasUser = !!auth.user.value?.userType;
@@ -247,9 +243,8 @@ router.beforeEach(async (to) => {
   }
 
   if (to.meta.smokeTestsOnly) {
-    const { ensureLoaded, allowed } = useSmokeTestsAllowed();
-    await ensureLoaded();
-    if (!allowed.value) return '/';
+    const { allowed } = useSmokeTestsAllowed();
+    if (allowed.value === false) return '/';
   }
 
   return true;