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/middleware/auditLog.ts

@@ -1,5 +1,6 @@
 import { AuthRequest } from './auth'
 import prisma from '../lib/prisma'
+import logger from '../lib/logger'
 
 export async function auditLog(
   req: AuthRequest,
@@ -22,6 +23,6 @@ export async function auditLog(
       },
     })
   } catch (err) {
-    console.error('Audit log error:', err)
+    logger.error({ err, action, entity, entityId }, 'Audit log error')
   }
 }

backend/src/middleware/errorHandler.ts

@@ -2,6 +2,7 @@ import { Request, Response, NextFunction } from 'express'
 import { ZodError } from 'zod'
 import { PrismaClientKnownRequestError } from '@prisma/client/runtime/library'
 import { AppError } from '../lib/AppError'
+import logger from '../lib/logger'
 
 export function errorHandler(err: unknown, _req: Request, res: Response, _next: NextFunction) {
   if (err instanceof AppError) {
@@ -55,7 +56,7 @@ export function errorHandler(err: unknown, _req: Request, res: Response, _next:
     })
   }
 
-  console.error('Unhandled error:', err)
+  logger.error({ err }, 'Unhandled error')
   return res.status(500).json({
     success: false,
     error: { code: 'INTERNAL_ERROR', message: '服务器内部错误' },