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）

apps/web/package.json

@@ -16,6 +16,7 @@
     "test:e2e": "playwright test",
     "test:storybook": "echo 'storybook is a Sprint 5 task'",
     "chromatic": "chromatic --project-token=__CHROMATIC_TOKEN__ --exit-zero-on-changes",
+    "lhci": "lhci autorun --config=./lighthouserc.cjs",
     "codegen": "tsx scripts/codegen.ts",
     "codegen:check": "tsx scripts/codegen-check.ts",
     "clean": "rm -rf dist .vite .turbo coverage playwright-report test-results"
@@ -45,6 +46,7 @@
   },
   "devDependencies": {
     "@eslint/js": "^9.39.4",
+    "@lhci/cli": "^0.14.0",
     "@playwright/test": "^1.49.0",
     "@tailwindcss/vite": "^4",
     "@testing-library/jest-dom": "^6.6.3",