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

backend/src/routes/import.routes.ts

@@ -324,7 +324,7 @@ router.post('/excel', authMiddleware, requireAdmin, upload.single('file'), async
           })
 
           result.employees++
-          result.details.push({ sheet: '员工信息', row: i + 2, name, status: 'success', message: '导入成功' })
+          result.details.push({ sheet: '员工信息', row: i + 2, name, employeeId: emp.id, status: 'success', message: '导入成功' })
         } catch (e: any) {
           const msg = e?.message || ''
           if (msg.includes('Unique constraint')) {
@@ -720,7 +720,6 @@ router.post('/payroll', authMiddleware, upload.single('file'), async (req: AuthR
   try {
     if (!req.file) return res.status(400).json({ success: false, message: '请上传文件' })
     const orgId = req.user!.orgId
-    const userId = req.user!.id
     const batchId = req.body.batchId as string
     if (!batchId) return res.status(400).json({ success: false, message: '缺少批次ID' })