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/pages/portal/EmployeeHome.tsx

@@ -9,17 +9,9 @@ import {
   DollarSign, FileText, CalendarCheck, ScrollText,
   TrendingUp, Clock, AlertCircle, ChevronRight,
 } from 'lucide-react'
+import { portalApi } from '../../lib/api-services'
 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 = axios.create({ baseURL: '/api/v1/portal' })
-portalApi.interceptors.request.use((config: any) => {
-  const token = localStorage.getItem('portalToken')
-  if (token) config.headers.Authorization = `Bearer ${token}`
-  return config
-})
 
 /** 金额格式化 */
 const fmt = (n: number) => (n || 0).toLocaleString('zh-CN', { minimumFractionDigits: 2, maximumFractionDigits: 2 })
@@ -41,8 +33,7 @@ export default function EmployeeHome() {
   const { data: overview, isLoading } = useQuery<any>({
     queryKey: ['portal-home-overview'],
     queryFn: async () => {
-      const res = await portalApi.get('/home/overview') as any
-      return res.data
+      return await portalApi.homeOverview()
     },
   })