优化: 大文件拆分+代码分割+按需加载+console清理+any类型替换

- Money.tsx (2260行→54行): 拆分为 money/ 子目录4个组件, React.lazy二级分割
- AIAssistant.tsx (2038行→63行): 拆分为 ai-assistant/ 子目录6个组件, React.lazy二级分割
- xlsx改为动态导入, OvertimeTab从345KB降至12.7KB
- api-services.ts: 请求参数 any→Record<string,unknown>
- 移除前端3处console.log残留
- 后端console替换为pino logger
- 前后端未使用import/变量清理
- Zod schema验证: termination/platform/special-status/work-process
- 新增 leave.routes.ts, acceptance-test.routes.ts
- UI组件: PageGuide, QueryError, Stepper

frontend/src/components/ui/CommandPalette.tsx

@@ -24,6 +24,7 @@ const QUICK_PAGES: SearchResult[] = [
   { type: 'page', id: 'social', title: '社保公积金', link: '/social', icon: 'shield' },
   { type: 'page', id: 'termination', title: '离职管理', link: '/termination', icon: 'userX' },
   { type: 'page', id: 'attendance', title: '考勤排班', link: '/attendance', icon: 'calendar' },
+  { type: 'page', id: 'leave-approval', title: '休假审批', link: '/leave-approval', icon: 'calendar' },
   { type: 'page', id: 'risk-center', title: '风险中心', link: '/risk-center', icon: 'alert' },
   { type: 'page', id: 'salary-dashboard', title: '薪酬分析', link: '/salary-dashboard', icon: 'chart' },
   { type: 'page', id: 'policies', title: '规章制度', link: '/policies', icon: 'file' },