前端真实 a11y 审计：新增 axe-core（devDep）+ tests/a11y.test.tsx，对登录页与注册页渲染完整表单后运行 axe 结构性规则（label/button-name/heading-order/landmark/aria），两页均零违规。摸清并处理了渲染依赖（UserProvider 会话检查、publicConfigQuery 门控、configBool 字符串语义）。vitest 116→118 全绿。

Result: {"status":"keep","total_issues":8,"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_usestdlibvars":0,"golint_wastedassign":0,"golint_total":8,"golint_test_testifylint":0,"golint_test_thelper":0,"golint_test_usetesting":0,"golint_test_total":0,"golint_vetx_total":0,"eslint_problems":0,"eslint_errors":0,"eslint_warnings":0,"tsc_errors":0,"vitest_failed":0,"vitest_total":118,"measure_s":71}

frontend/package.json

@@ -95,6 +95,7 @@
     "@types/node": "^26.1.2",
     "@types/react": "^19.2.18",
     "@types/react-dom": "^19.2.4",
+    "axe-core": "^4.13.0",
     "eslint": "^9.39.5",
     "eslint-config-next": "16.3.0",
     "eslint-plugin-unused-imports": "^4.4.1",