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/lib/logger.ts

@@ -0,0 +1,23 @@
+import pino from 'pino'
+
+const isDev = process.env.NODE_ENV !== 'production'
+
+const logger = pino({
+  level: process.env.LOG_LEVEL || (isDev ? 'debug' : 'info'),
+  transport: isDev
+    ? {
+        target: 'pino-pretty',
+        options: {
+          colorize: true,
+          translateTime: 'HH:MM:ss',
+          ignore: 'pid,hostname',
+        },
+      }
+    : undefined,
+  redact: {
+    paths: ['req.headers.authorization', 'req.headers.cookie', '*.password', '*.passwordHash', '*.token', '*.refreshToken'],
+    censor: '[REDACTED]',
+  },
+})
+
+export default logger