fix: 修复 portal 页面 top-level await 导致生产构建失败

frontend/src/pages/portal/EmployeeHome.tsx

@@ -11,9 +11,10 @@ import {
 } from 'lucide-react'
 import Card from '../../components/ui/Card'
 import { InlineAlert } from '../../components/ui/InlineAlert'
+import axios from 'axios'
 
 /** 员工端 API 实例（自动携带 portalToken） */
-const portalApi = (await import('../../lib/api')).default.create({ baseURL: '/api/v1/portal' })
+const portalApi = axios.create({ baseURL: '/api/v1/portal' })
 portalApi.interceptors.request.use((config: any) => {
   const token = localStorage.getItem('portalToken')
   if (token) config.headers.Authorization = `Bearer ${token}`

frontend/src/pages/portal/OnboardingProgress.tsx

@@ -7,9 +7,10 @@ import { Check, Clock, AlertCircle, FileText, Upload, User, Phone, Banknote } fr
 import Card from '../../components/ui/Card'
 import { InlineAlert } from '../../components/ui/InlineAlert'
 import { Stepper } from '../../components/ui/Stepper'
+import axios from 'axios'
 
 /** 员工端 API 实例 */
-const portalApi = (await import('../../lib/api')).default.create({ baseURL: '/api/v1/portal' })
+const portalApi = axios.create({ baseURL: '/api/v1/portal' })
 portalApi.interceptors.request.use((config: any) => {
   const token = localStorage.getItem('portalToken')
   if (token) config.headers.Authorization = `Bearer ${token}`

frontend/src/pages/portal/ResignationApply.tsx

@@ -9,9 +9,10 @@ import Card from '../../components/ui/Card'
 import Button from '../../components/ui/Button'
 import { Input, Label, Select } from '../../components/ui/Input'
 import { InlineAlert } from '../../components/ui/InlineAlert'
+import axios from 'axios'
 
 /** 员工端 API 实例 */
-const portalApi = (await import('../../lib/api')).default.create({ baseURL: '/api/v1/portal' })
+const portalApi = axios.create({ baseURL: '/api/v1/portal' })
 portalApi.interceptors.request.use((config: any) => {
   const token = localStorage.getItem('portalToken')
   if (token) config.headers.Authorization = `Bearer ${token}`