feat: AI历史记录、企业信息seed、员工状态自动刷新、风险预测数据准确性优化

- 智能问答/风险预测/合同审查/案例匹配 均支持历史记录保存、加载、删除
- 后端 predict/predict-stream 补充离职记录详情和预计算工龄/天数，避免AI计算错误
- Organization 增加 contactName/contactPhone 字段，seed 企业信息
- Settings 页面修复 orgData/usersData 取值路径错误
- Roster/Termination/Contracts mutation 增加 roster cache invalidation
- 员工档案页面 tab 固定、内容区域滚动到窗口底部
- 解聘证据链显示逻辑修复（协商一致离职 vs 员工主动离职）

frontend/src/pages/Termination.tsx

@@ -1,7 +1,7 @@
 import { useState, useMemo, useEffect } from 'react'
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
 import { toast } from 'sonner'
-import { AlertTriangle, Check, ChevronRight, ChevronLeft, Shield, Info, Calculator, FileText, Printer, Trash2, List, Download, Plus, Edit, Send, CheckCircle, XCircle, Play, Ban } from 'lucide-react'
+import { AlertTriangle, Check, ChevronRight, ChevronLeft, Shield, Info, Calculator, FileText, Printer, Trash2, List, Download, Plus, Edit, Send, CheckCircle, XCircle, Play, Ban, CheckCheck } from 'lucide-react'
 import jsPDF from 'jspdf'
 import api from '../lib/api'
 import Card from '../components/ui/Card'
@@ -229,6 +229,9 @@ export default function Termination() {
     onSuccess: () => {
       queryClient.invalidateQueries({ queryKey: ['dashboard'] })
       queryClient.invalidateQueries({ queryKey: ['employees'] })
+      queryClient.invalidateQueries({ queryKey: ['roster'] })
+      queryClient.invalidateQueries({ queryKey: ['roster-profile'] })
+      queryClient.invalidateQueries({ queryKey: ['evidence-chain'] })
       setStep(5)
     },
   })
@@ -308,7 +311,9 @@ export default function Termination() {
       toast.success('解聘已执行')
       queryClient.invalidateQueries({ queryKey: ['termination-drafts'] })
       queryClient.invalidateQueries({ queryKey: ['dashboard'] })
-      queryClient.invalidateQueries({ queryKey: ['employees'] })
+      queryClient.invalidateQueries({ queryKey: ['roster'] })
+      queryClient.invalidateQueries({ queryKey: ['roster-profile'] })
+      queryClient.invalidateQueries({ queryKey: ['evidence-chain'] })
       setView('list')
       resetWizard()
     },
@@ -321,6 +326,8 @@ export default function Termination() {
     onSuccess: () => {
       toast.success('已撤销')
       queryClient.invalidateQueries({ queryKey: ['termination-drafts'] })
+      queryClient.invalidateQueries({ queryKey: ['roster'] })
+      queryClient.invalidateQueries({ queryKey: ['dashboard'] })
       setView('list')
     },
     onError: () => toast.error('撤销失败'),
@@ -410,7 +417,7 @@ export default function Termination() {
   }, [selectedEmployee, terminationDate, socialAvgWage, reason])
 
   const canProceed = () => {
-    if (step === 0) return !!employeeId && !selectedEmployee?.hasTermination
+    if (step === 0) return !!employeeId && (!!draftId || !selectedEmployee?.hasTermination)
     if (step === 1) return !!reason && !!terminationDate && (!riskAssessment?.warnings.length || acknowledgeRisk)
     if (step === 2) return true
     if (step === 3) return true
@@ -673,6 +680,21 @@ export default function Termination() {
                               <Edit className="w-3.5 h-3.5" />
                             </button>
                           )}
+                          {item.status === 'DRAFT' && (
+                            <button
+                              onClick={() => {
+                                if (confirm(`确认执行「${item.employeeName}」的解聘手续？\n确认后员工状态将变更为离职，社保/公积金将停缴，此操作不可撤销。`)) {
+                                  setDraftId(item.id)
+                                  executeMutation.mutate()
+                                }
+                              }}
+                              className="p-1 text-safe hover:opacity-70"
+                              aria-label="确定"
+                              title="确定执行"
+                            >
+                              <CheckCheck className="w-3.5 h-3.5" />
+                            </button>
+                          )}
                           {item.status === 'PENDING_APPROVAL' && (
                             <>
                               <button