Sprint 4 T-B-24 · Lighthouse CI (G3 闸门真实化)

- apps/web/lighthouserc.cjs: desktop preset, 3 runs, P/A/B/S ≥ 90 断言
- apps/web/scripts/lhci-scores.cjs: 本地汇总脚本（median P/A/B/S + ✅/❌ 标记）
- .github/workflows/web-ci.yml: 新增 lighthouse job，treosh/lighthouse-ci-action@v12
- apps/web/package.json: +lhci script
- apps/web/.gitignore: .lighthouseci/ 加入忽略（避免本地 12 个 run 报告污染 repo）

本地验证（desktop preset, 3 runs × 4 URLs）：
  perf=100  a11y=95-96  best=96  seo=91  (全部 ≥ 90 ✅)

G3 闸门状态：typecheck ✅ / lint ✅ / vitest 69 ✅ / e2e 84/84 ✅
             / build 87.85KB ✅ / Lighthouse P/A/B/S ✅
             / 真实后端 ⏳（T-B-27）/ Poster CLI Docker ⏳（T-C-44）

.github/workflows/web-ci.yml

@@ -127,3 +127,42 @@ jobs:
           workingDir: apps/web
           buildScriptName: build
           exitZeroOnChanges: true
+
+  lighthouse:
+    # G3 闸门真实化：P/A/B/S 均 ≥ 90
+    runs-on: ubuntu-latest
+    needs: ci
+    timeout-minutes: 15
+    if: github.event_name == 'push' || github.event_name == 'pull_request'
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'pnpm'
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Build
+        run: pnpm --filter @gaokao/web build
+
+      - name: Run Lighthouse CI (G3 闸门：P/A/B/S ≥ 90)
+        uses: treosh/lighthouse-ci-action@v12
+        with:
+          configPath: ./apps/web/lighthouserc.cjs
+          uploadArtifacts: true
+          temporaryPublicStorage: true
+          runs: 3
+          serverUrl: http://127.0.0.1:8080/
+          # treosh action 自动启动 vite preview @ 8080
+          url: |
+            http://127.0.0.1:8080/
+            http://127.0.0.1:8080/data-query
+            http://127.0.0.1:8080/plans
+            http://127.0.0.1:8080/about