fix(frontend): auto-attach admin api keys and normalize admin list payloads

src/pages/admin/PermissionGroupsPage.vue

@@ -145,8 +145,12 @@ async function loadGroups() {
   loadingGroups.value = true
   try {
     const res = await getPermissionGroups()
-    groups.value = res.data || []
+    groups.value = res.data?.items || []
   } catch (err) {
+    if (err.response?.status === 422) {
+      ElMessage.error('缺少管理員 API 認證，請檢查前端 .env.development')
+      return
+    }
     ElMessage.error('載入群組失敗')
   } finally {
     loadingGroups.value = false