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/roster/PerformanceInfo.tsx

@@ -1,7 +1,7 @@
 import { useState, useRef } from "react"
 import { toast } from "sonner"
 import { useQuery, useMutation, useQueryClient } from "@tanstack/react-query"
-import api from "../../lib/api"
+import { rosterApi } from '../../lib/api-services'
 import Card from "../../components/ui/Card"
 import Button from "../../components/ui/Button"
 import { Input, Label, Select } from "../../components/ui/Input"
@@ -17,12 +17,12 @@ export default function PerformanceInfo({ employeeId, records }: { employeeId: s
   const [form, setForm] = useState({ period: '', score: 80, grade: 'B', result: 'QUALIFIED', summary: '', improvementPlan: '', employeeAck: false, ackDate: '', reviewer: '' })
 
   const createMutation = useMutation({
-    mutationFn: (data: any) => api.post(`/roster/${employeeId}/performance`, data),
+    mutationFn: (data: any) => rosterApi.performance(employeeId, data),
     onSuccess: () => { queryClient.invalidateQueries({ queryKey: ['roster-profile'] }); setShowForm(false) },
   })
 
   const deleteMutation = useMutation({
-    mutationFn: (id: string) => api.delete(`/roster/${employeeId}/performance/${id}`),
+    mutationFn: (id: string) => rosterApi.removePerformance(employeeId, id),
     onSuccess: () => queryClient.invalidateQueries({ queryKey: ['roster-profile'] }),
   })