test: Phase 0 测试基础设施 — TestApp + MSW + 覆盖率工具 + CI

- TestApp struct 封装 TestDb + HealthState + tenant_id/operator_id
- TestFixture 工厂方法: create_patient/create_doctor/create_schedule/create_appointment
- 前端 MSW v2 handlers (auth) + server setup + vitest 集成
- vitest coverage v8 配置 + test:coverage script
- GitHub Actions CI: backend (check + test + clippy) + frontend (tsc + test + build)

apps/web/package.json

@@ -9,6 +9,7 @@
     "lint": "eslint .",
     "preview": "vite preview",
     "test": "vitest",
+    "test:coverage": "vitest run --coverage",
     "test:e2e": "playwright test",
     "test:e2e:ui": "playwright test --ui"
   },
@@ -38,15 +39,22 @@
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
     "@vitejs/plugin-react": "^6.0.1",
+    "@vitest/coverage-v8": "^4.1.5",
     "eslint": "^9.39.4",
     "eslint-plugin-react-hooks": "^7.0.1",
     "eslint-plugin-react-refresh": "^0.5.2",
     "globals": "^17.4.0",
     "jsdom": "^29.0.2",
+    "msw": "^2.13.6",
     "tailwindcss": "^4.2.2",
     "typescript": "~6.0.2",
     "typescript-eslint": "^8.58.0",
     "vite": "^8.0.4",
     "vitest": "^4.1.5"
+  },
+  "msw": {
+    "workerDirectory": [
+      "public"
+    ]
   }
-}
+}