认证页 axe a11y 审计+修复：7 处布局级真实违规全修，复扫验证 dashboard/admin/system 归零；基准 total_issues 保持 8 不变（纯质量收益）

Result: {"status":"keep","total_issues":8,"eslint_errors":0,"eslint_problems":0,"eslint_warnings":0,"golint_canonicalheader":0,"golint_errname":0,"golint_errorlint":1,"golint_exhaustive":0,"golint_forcetypeassert":0,"golint_gosec":0,"golint_intrange":0,"golint_modernize":3,"golint_nilnil":3,"golint_perfsprint":0,"golint_prealloc":0,"golint_recvcheck":1,"golint_test_testifylint":0,"golint_test_thelper":0,"golint_test_total":0,"golint_test_usetesting":0,"golint_total":8,"golint_usestdlibvars":0,"golint_vetx_total":0,"golint_wastedassign":0,"measure_s":93,"tsc_errors":0,"vitest_failed":0,"vitest_total":126}

frontend/messages/fragments/core.en.json

@@ -10,7 +10,9 @@
     "settings": "Settings",
     "search": "Search",
     "unknownError": "Something went wrong. Please try again.",
-    "loadFailed": "Load failed"
+    "loadFailed": "Load failed",
+    "previousPage": "Previous page",
+    "nextPage": "Next page"
   },
   "contexts": {
     "adminUsers": {

frontend/messages/fragments/core.zh-CN.json

@@ -10,7 +10,9 @@
     "settings": "设置",
     "search": "搜索",
     "unknownError": "发生错误，请重试",
-    "loadFailed": "加载失败"
+    "loadFailed": "加载失败",
+    "previousPage": "上一页",
+    "nextPage": "下一页"
   },
   "contexts": {
     "adminUsers": {

frontend/messages/fragments/layout.en.json

@@ -134,6 +134,8 @@
     "empty": {
       "noData": "No data",
       "noContent": "No records found"
-    }
+    },
+    "toggleSidebar": "Toggle sidebar",
+    "mainNavigation": "Main navigation"
   }
 }

frontend/messages/fragments/layout.zh-CN.json

@@ -134,6 +134,8 @@
     "empty": {
       "noData": "暂无数据",
       "noContent": "当前没有任何记录"
-    }
+    },
+    "toggleSidebar": "切换侧边栏",
+    "mainNavigation": "主导航"
   }
 }