docs(admin-portal): 新增 nextstep-v2.md 记录下游核查结果

v1 声称完成的下游工作经核查实际未完成：
- api-gateway: /api/admin/graphql 路由未注册，go vet 编译失败
- teacher-bff: resolver 已完成但 schema 未同步（命名空间 vs 扁平）
- iam: proto 缺 BatchGetUsers rpc 声明

v2 记录详细核查证据和修复要求

apps/teacher-portal/package.json

@@ -7,7 +7,13 @@
     "build": "next build",
     "start": "next start -p 4000",
     "lint": "eslint src",
-    "typecheck": "tsc --noEmit"
+    "lint:tokens": "eslint -c .eslintrc.tokens.js src",
+    "lint:a11y": "eslint -c .eslintrc.a11y.js src",
+    "typecheck": "tsc --noEmit",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "size": "size-limit",
+    "size:why": "size-limit --why"
   },
   "dependencies": {
     "@edu/hooks": "workspace:*",
@@ -23,6 +29,7 @@
     "@sentry/nextjs": "^8.0.0",
     "graphql": "^16.8.0",
     "next": "^14.2.0",
+    "next-intl": "^3.0.0",
     "react": "^18.3.0",
     "react-dom": "^18.3.0",
     "urql": "^2.2.0",
@@ -31,18 +38,23 @@
   "devDependencies": {
     "@module-federation/nextjs-mf": "^8.3.0",
     "@next/bundle-analyzer": "^14.2.0",
+    "@testing-library/jest-dom": "^6.4.0",
+    "@testing-library/react": "^16.0.0",
     "@types/node": "^22.0.0",
     "@types/react": "^18.3.0",
     "@types/react-dom": "^18.3.0",
+    "@vitejs/plugin-react": "^4.3.0",
     "autoprefixer": "^10.4.0",
     "axe-core": "^4.10.0",
     "eslint": "^9.0.0",
     "eslint-plugin-jsx-a11y": "^6.9.0",
+    "jsdom": "^25.0.0",
     "msw": "^2.4.0",
     "postcss": "^8.4.0",
     "size-limit": "^11.1.0",
     "tailwindcss": "^3.4.0",
-    "typescript": "^5.6.0"
+    "typescript": "^5.6.0",
+    "vitest": "^2.0.0"
   },
   "msw": {
     "workerDirectory": [