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/pages/SalaryDashboard.tsx

@@ -9,6 +9,8 @@ import {
 import Card from '../components/ui/Card'
 import { Select } from '../components/ui/Input'
 import { InlineAlert } from '../components/ui/InlineAlert'
+import PageGuide from '../components/ui/PageGuide'
+import QueryError from '../components/ui/QueryError'
 import { salaryDashboardApi } from '../lib/api-services'
 
 /** 金额格式化 */
@@ -18,7 +20,7 @@ export default function SalaryDashboard() {
   const [year, setYear] = useState(new Date().getFullYear().toString())
 
   /** 获取薪酬分析数据 */
-  const { data, isLoading } = useQuery<any>({
+  const { data, isLoading, isError, error, refetch } = useQuery<any>({
     queryKey: ['salary-dashboard', year],
     queryFn: async () => {
       return await salaryDashboardApi.data(Number(year))
@@ -37,6 +39,9 @@ export default function SalaryDashboard() {
 
   return (
     <div className="space-y-4">
+      <PageGuide>
+        薪酬分析看板展示企业薪酬分布、部门间薪酬对比及年度趋势变化。选择年份后查看各部门薪酬数据、同比环比变化。用于辅助薪酬决策和成本控制。
+      </PageGuide>
       {/* 页头 */}
       <div className="flex items-center justify-between">
         <div className="flex items-center gap-2">
@@ -55,6 +60,8 @@ export default function SalaryDashboard() {
 
       {isLoading ? (
         <div className="text-center py-8 text-gray-400">加载中...</div>
+      ) : isError ? (
+        <QueryError error={error} onRetry={refetch} />
       ) : !data ? (
         <Card><div className="text-center py-8 text-gray-400 text-sm">暂无数据</div></Card>
       ) : (