refactor: API口径统一 — 统计函数/员工列表/前端服务层

后端:
- /dashboard/compliance-score 改用 getHealthCheck，与体检诊断同口径
- 新增 /employees/list 端点（不分页，供各页面下拉选择）
- /employees/all-lite 增加 position 字段和 status 筛选参数
- getHealthCheck 未签合同改为查无合同记录的员工（非UNSIGNED类型）

前端:
- 新建 lib/api-services.ts 统一 API 服务层
- employeeApi/rosterApi/dashboardApi/attendanceApi 统一封装
- 6个页面迁移到统一 API 调用:
  - Attendance: employeeApi.list + rosterApi.departments
  - Termination: rosterApi.list + rosterApi.departments
  - Money: rosterApi.list + rosterApi.departments
  - PortalQRModal: employeeApi.list
  - AIAssistant: 3处 employeeApi.list 替代 /roster?pageSize=999
  - Contracts: rosterApi.departments
  - Dashboard: rosterApi.expiringContracts + dashboardApi.healthCheck/workforceStats

frontend/src/pages/AIAssistant.tsx

@@ -8,6 +8,7 @@ import rehypeRaw from 'rehype-raw'
 import { Document, Packer, Paragraph, HeadingLevel, TextRun, Table, TableRow, TableCell, WidthType, BorderStyle, AlignmentType } from 'docx'
 import { saveAs } from 'file-saver'
 import api from '../lib/api'
+import { employeeApi } from '../lib/api-services'
 import { useAuthStore } from '../store/authStore'
 import Card from '../components/ui/Card'
 import Button from '../components/ui/Button'
@@ -633,11 +634,8 @@ function PredictTab() {
   const [disciplinarySummary, setDisciplinarySummary] = useState('')
 
   const { data: employees } = useQuery<any[]>({
-    queryKey: ['roster-list'],
-    queryFn: async () => {
-      const res = await api.get('/roster?pageSize=999') as any
-      return res.data?.items || res.data || []
-    },
+    queryKey: ['employee-list'],
+    queryFn: () => employeeApi.list({ status: 'ACTIVE' }),
   })
 
   const departments = [...new Set((employees || []).map((e: any) => e.department).filter(Boolean))]
@@ -1384,11 +1382,8 @@ function ReviewTab() {
   }
 
   const { data: employees } = useQuery<any[]>({
-    queryKey: ['roster-list'],
-    queryFn: async () => {
-      const res = await api.get('/roster') as any
-      return res.data?.items || res.data || []
-    },
+    queryKey: ['employee-list'],
+    queryFn: () => employeeApi.list({ status: 'ACTIVE' }),
   })
 
   const handleReview = async () => {
@@ -1580,11 +1575,8 @@ function CaseTab() {
   const { history, saveMutation, deleteMutation, loadHistory } = useAIHistory('case')
 
   const { data: employees } = useQuery<any[]>({
-    queryKey: ['roster-list'],
-    queryFn: async () => {
-      const res = await api.get('/roster') as any
-      return res.data?.items || res.data || []
-    },
+    queryKey: ['employee-list'],
+    queryFn: () => employeeApi.list({ status: 'ACTIVE' }),
   })
 
   const handleMatch = async () => {

frontend/src/pages/Attendance.tsx

@@ -3,6 +3,7 @@ import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
 import { toast } from 'sonner'
 import { CalendarCheck, CheckCircle, Clock, AlertCircle, Plus, Trash2, Calendar, Users, BarChart3, Plane, Upload, Download, X, Send, Loader2, CheckCheck } from 'lucide-react'
 import api from '../lib/api'
+import { employeeApi, rosterApi } from '../lib/api-services'
 import { useAuthStore } from '../store/authStore'
 import Card from '../components/ui/Card'
 import Button from '../components/ui/Button'
@@ -124,10 +125,7 @@ function ConfirmTab() {
 
   const { data: departmentList } = useQuery<string[]>({
     queryKey: ['roster-departments'],
-    queryFn: async () => {
-      const res = await api.get('/roster/departments') as any
-      return res.data || []
-    },
+    queryFn: () => rosterApi.departments(),
   })
 
   const { data: publishRecords } = useQuery<any[]>({
@@ -982,11 +980,8 @@ function LeavesTab() {
   })
 
   const { data: rosterData } = useQuery<any>({
-    queryKey: ['roster-employees'],
-    queryFn: async () => {
-      const res = await api.get('/roster?pageSize=200') as any
-      return res.data
-    },
+    queryKey: ['employee-list'],
+    queryFn: () => employeeApi.list({ status: 'ACTIVE' }),
   })
 
   const createMutation = useMutation({

frontend/src/pages/Compensation.tsx

@@ -2,6 +2,7 @@ import { useState, useMemo } from 'react'
 import { useQuery } from '@tanstack/react-query'
 import { Calculator, Info, AlertCircle } from 'lucide-react'
 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'

frontend/src/pages/Contracts.tsx

@@ -3,6 +3,7 @@ import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
 import { Plus, Search, Paperclip, Trash2, X, FileText, Download, Eye } from 'lucide-react'
 import { toast } from 'sonner'
 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'
@@ -66,10 +67,7 @@ export default function Contracts() {
 
   const { data: departmentList } = useQuery<string[]>({
     queryKey: ['roster-departments'],
-    queryFn: async () => {
-      const res = await api.get('/roster/departments') as any
-      return res.data || []
-    },
+    queryFn: () => rosterApi.departments(),
   })
 
   return (

frontend/src/pages/Dashboard.tsx

@@ -5,6 +5,7 @@ import { Link } from 'react-router-dom'
 import { PieChart, Pie, Cell, ResponsiveContainer, Tooltip, RadialBarChart, RadialBar, PolarAngleAxis } from 'recharts'
 import { Users, AlertTriangle, CheckSquare, DollarSign, ArrowRight, RefreshCw, FileText, Calendar, TrendingUp, Briefcase, Calculator, Wallet, Building2, Receipt, Check, X, Clock, LayoutDashboard, ListTodo, ShieldAlert, UserPlus, AlertCircle, Download, ChevronRight, TrendingDown, ShieldCheck, Lightbulb, BookOpen, Sparkles, Repeat, XCircle, Loader2 } from 'lucide-react'
 import api from '../lib/api'
+import { dashboardApi, rosterApi } from '../lib/api-services'
 import { useAuthStore } from '../store/authStore'
 import Card from '../components/ui/Card'
 import Button from '../components/ui/Button'
@@ -57,10 +58,7 @@ export default function Dashboard() {
 
   const { data: expiringContracts } = useQuery<any>({
     queryKey: ['expiring-contracts'],
-    queryFn: async () => {
-      const res = await api.get('/roster/contracts/expiring') as any
-      return res.data
-    },
+    queryFn: () => rosterApi.expiringContracts(),
   })
 
   const currentMonth = new Date().toISOString().slice(0, 7)
@@ -75,18 +73,12 @@ export default function Dashboard() {
 
   const { data: complianceScore } = useQuery<any>({
     queryKey: ['compliance-score'],
-    queryFn: async () => {
-      const res = await api.get('/dashboard/compliance-score') as any
-      return res.data
-    },
+    queryFn: () => dashboardApi.healthCheck(),
   })
 
   const { data: workforceStats } = useQuery<any>({
     queryKey: ['workforce-stats'],
-    queryFn: async () => {
-      const res = await api.get('/dashboard/workforce-stats') as any
-      return res.data
-    },
+    queryFn: () => dashboardApi.workforceStats(),
   })
 
   const resolveMutation = useMutation({

frontend/src/pages/Money.tsx

@@ -7,6 +7,7 @@ import { Calculator, AlertCircle, Info, Check, Upload, Layers, Settings as Setti
 import { Stepper, type Step } from '../components/ui/Stepper'
 import { InlineAlert } from '../components/ui/InlineAlert'
 import api from '../lib/api'
+import { rosterApi } from '../lib/api-services'
 import { useAuthStore } from '../store/authStore'
 import Card from '../components/ui/Card'
 import Button from '../components/ui/Button'
@@ -72,21 +73,14 @@ function CustomEmployeeSelector({ selectedIds, onChange }: { selectedIds: string
   const { data: employees } = useQuery<any>({
     queryKey: ['roster-for-batch', search, filterDept],
     queryFn: async () => {
-      const params: any = { pageSize: 999 }
-      if (search) params.search = search
-      if (filterDept) params.department = filterDept
-      params.status = 'ACTIVE'
-      const res = await api.get('/roster', { params }) as any
+      const res = await rosterApi.list({ pageSize: 999, search, department: filterDept, status: 'ACTIVE' })
       return res.data || []
     },
   })
 
   const { data: deptList } = useQuery<string[]>({
     queryKey: ['roster-departments'],
-    queryFn: async () => {
-      const res = await api.get('/roster/departments') as any
-      return res.data || []
-    },
+    queryFn: () => rosterApi.departments(),
   })
 
   const toggle = (id: string) => {

frontend/src/pages/Termination.tsx

@@ -6,6 +6,7 @@ import { Stepper } from '../components/ui/Stepper'
 import { InlineAlert } from '../components/ui/InlineAlert'
 import jsPDF from 'jspdf'
 import api from '../lib/api'
+import { rosterApi } from '../lib/api-services'
 import { useAuthStore } from '../store/authStore'
 import Card from '../components/ui/Card'
 import Button from '../components/ui/Button'
@@ -217,10 +218,10 @@ export default function Termination() {
   const [draftPage, setDraftPage] = useState(1)
   const [draftPageSize, setDraftPageSize] = useState(20)
 
-  const { data: employees } = useQuery<RosterEmployee[]>({
+  const { data: employees } = useQuery<any[]>({
     queryKey: ['roster-for-termination'],
     queryFn: async () => {
-      const res = await api.get('/roster') as any
+      const res = await rosterApi.list({ pageSize: 999 })
       return res.data
     },
   })
@@ -229,10 +230,7 @@ export default function Termination() {
 
   const { data: departmentList } = useQuery<string[]>({
     queryKey: ['roster-departments'],
-    queryFn: async () => {
-      const res = await api.get('/roster/departments') as any
-      return res.data || []
-    },
+    queryFn: () => rosterApi.departments(),
   })
 
   const { data: profile } = useQuery<EmployeeProfile>({