feat(client): 初始化前端壳与鉴权守卫（P1-5）

- 技术栈：React 18 + TypeScript + Vite + Tailwind

- API 层：ApiError + 401 自动刷新 + single-flight 重试

- 鉴权：内存 Access Token + Cookie Refresh + 启动 bootstrap

- RBAC：权限映射 + RequireAuth/RequirePermission 路由守卫

- 布局：OA 工作台壳层 + 侧边栏 + 5 个占位页面

- 样式：复用 hyb-web 视觉 token（单向同步）

- 文档：新增 client README，补充 server 联调说明

client/package.json

@@ -0,0 +1,29 @@
+{
+  "name": "client",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "npm run typecheck && vite build",
+    "typecheck": "tsc --noEmit",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "clsx": "^2.1.1",
+    "react": "^18.2.0",
+    "react-dom": "^18.2.0",
+    "react-router-dom": "^6.22.0",
+    "tailwind-merge": "^2.6.1"
+  },
+  "devDependencies": {
+    "@types/react": "^18.2.55",
+    "@types/react-dom": "^18.2.19",
+    "@vitejs/plugin-react": "^4.2.1",
+    "autoprefixer": "^10.4.17",
+    "postcss": "^8.4.35",
+    "tailwindcss": "^3.4.1",
+    "typescript": "^5.4.5",
+    "vite": "^5.1.0"
+  }
+}