refactor: 全量迁移前端 API 调用到统一 api-services 服务层

- 新建 api-services-raw.ts 导出原始 axios 方法供特殊端点使用
- 完成 api-services.ts 全领域覆盖（auth/employee/roster/dashboard/attendance/payroll/socialInsurance/commercialInsurance/termination/policies/evidence/audit/calendar/companyFiles/notifications/settings/ai/platform/portal/survey/search）
- 迁移所有 47+ 页面文件：pages/、pages/roster/、pages/portal/、pages/platform/、pages/auth/、pages/dashboard/、pages/compliance/
- 移除所有直接 import api from '../../lib/api' 引用
- 修复 Termination.tsx / WorkProcess.tsx 中 string|null 类型错误
- 修复 SocialInsurance.tsx 中 api-services-raw delete 导入名
- 修复 PlatformLogin.tsx 变量遮蔽问题
- tsc --noEmit 零错误，vite build 成功

frontend/src/components/PortalQRModal.tsx

@@ -6,8 +6,7 @@ import { useState, useEffect } from 'react'
 import { QRCodeSVG } from 'qrcode.react'
 import { Smartphone, Copy, Check, Search, Loader2, User, ChevronRight } from 'lucide-react'
 import Modal from './ui/Modal'
-import api from '../lib/api'
-import { employeeApi } from '../lib/api-services'
+import { employeeApi, portalApi } from '../lib/api-services'
 
 interface Employee {
   id: string
@@ -47,8 +46,8 @@ export default function PortalQRModal({ open, onClose }: { open: boolean; onClos
     setGenerating(true)
     setAutoLoginUrl('')
     try {
-      const res = await api.post('/portal/auto-login-token', { employeeId: emp.id }) as any
-      const token = res.data?.token
+      const res = await portalApi.generateAutoLoginToken(emp.id) as any
+      const token = res?.token
       if (token) {
         setAutoLoginUrl(`${window.location.origin}/portal/auto-login?token=${token}`)
       }