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/layout/SidebarNav.tsx

@@ -13,7 +13,7 @@ import {
   Bot, BookMarked,
   Bell, ScrollText, Settings,
   ChevronDown, ChevronRight,
-  Building2, CalendarDays, ClipboardList, Heart,
+  Building2, CalendarDays, ClipboardList, Heart, CalendarClock,
 } from 'lucide-react'
 import Logo from '../ui/Logo'
 
@@ -33,7 +33,7 @@ const navGroups: NavGroup[] = [
     title: '首页',
     items: [
       { path: '/', label: '工作台', icon: LayoutDashboard },
-      { path: '/calendar', label: '工作日历', icon: CalendarDays },
+      { path: '/calendar', label: '日历', icon: CalendarDays },
     ],
   },
   {
@@ -57,6 +57,7 @@ const navGroups: NavGroup[] = [
     title: '时间',
     items: [
       { path: '/attendance', label: '考勤排班', icon: CalendarCheck },
+      { path: '/leave-approval', label: '休假审批', icon: CalendarClock },
     ],
   },
   {
@@ -66,14 +67,14 @@ const navGroups: NavGroup[] = [
       { path: '/evidence', label: '证据链', icon: FileSearch },
       { path: '/policies', label: '规章制度', icon: FileText },
       { path: '/tools/health-check', label: '用工体检', icon: Stethoscope },
-      { path: '/tools/medical-period', label: '医疗期计算', icon: HeartPulse },
+      { path: '/tools/medical-period', label: '医疗期', icon: HeartPulse },
       { path: '/tools/annual-value', label: '年度价值', icon: Award },
     ],
   },
   {
     title: '更多',
     items: [
-      { path: '/ai-assistant', label: 'AI 顾问', icon: Bot },
+      { path: '/ai-assistant', label: 'AI顾问', icon: Bot },
       { path: '/templates', label: '文本模板', icon: BookMarked },
       { path: '/notifications', label: '通知管理', icon: Bell },
       { path: '/audit', label: '操作日志', icon: ScrollText },