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/auth/Login.tsx

@@ -6,7 +6,7 @@ import { useForm } from 'react-hook-form'
 import { zodResolver } from '@hookform/resolvers/zod'
 import { z } from 'zod'
 import { useAuthStore } from '../../store/authStore'
-import api from '../../lib/api'
+import { authApi } from '../../lib/api-services'
 import { Input, Label } from '../../components/ui/Input'
 import Button from '../../components/ui/Button'
 
@@ -52,13 +52,13 @@ export default function Login() {
     setError('')
     setLoading(true)
     try {
-      const res = await api.post('/auth/login', data) as any
+      const res = await authApi.login(data) as any
       if (remember) {
         localStorage.setItem('admin-login-remember', JSON.stringify({ phone: data.phone, password: data.password }))
       } else {
         localStorage.removeItem('admin-login-remember')
       }
-      setAuth(res.data.user, res.data.accessToken, res.data.refreshToken)
+      setAuth(res.user, res.accessToken, res.refreshToken)
       navigate('/')
     } catch (err: any) {
       setError(err.response?.data?.error?.message || '登录失败，请稍后重试')