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/Roster.tsx

@@ -82,7 +82,7 @@ export default function Roster() {
     mutationFn: (data: any) => api.post('/termination/draft', {
       employeeId: data.employeeId,
       type: 'RESIGNATION',
-      reason: 'NEGOTIATED',
+      reason: 'RESIGNATION',
       terminationDate: data.terminationDate,
       resignationReason: data.resignationReason,
       remark: data.remark,
@@ -792,8 +792,8 @@ function EmployeeProfile({ employeeId, onBack }: { employeeId: string; onBack: (
   if (!profile) return <div className="text-center py-8 text-gray-400">员工不存在</div>
 
   return (
-    <div className="space-y-3">
-      <div className="flex items-center gap-3">
+    <div className="flex flex-col h-[calc(100vh-120px)]">
+      <div className="flex items-center gap-3 shrink-0 pb-3">
         <button onClick={onBack} className="text-gray-400 hover:text-gray-600">
           <X className="w-5 h-5" />
         </button>
@@ -803,7 +803,7 @@ function EmployeeProfile({ employeeId, onBack }: { employeeId: string; onBack: (
         </span>
       </div>
 
-      <div className="flex gap-1 border-b overflow-x-auto">
+      <div className="flex gap-1 border-b overflow-x-auto shrink-0">
         {tabs.map((t) => {
           const Icon = t.icon
           return (
@@ -821,6 +821,7 @@ function EmployeeProfile({ employeeId, onBack }: { employeeId: string; onBack: (
         })}
       </div>
 
+      <div className="flex-1 overflow-y-auto pt-3">
       {tab === 'basic' && <BasicInfo profile={profile} />}
       {tab === 'contract' && <ContractInfo employeeId={employeeId} contracts={profile.contracts} hireDate={profile.hireDate} />}
       {tab === 'payslip' && <PayslipInfo payslips={profile.payslips} />}
@@ -832,6 +833,7 @@ function EmployeeProfile({ employeeId, onBack }: { employeeId: string; onBack: (
       {tab === 'termination' && <TerminationInfo employeeId={employeeId} profile={profile} records={profile.terminations} />}
       {tab === 'attachment' && <AttachmentInfo employeeId={employeeId} attachments={profile.attachments} />}
       {tab === 'evidence' && <EvidenceChain employeeId={employeeId} />}
+      </div>
     </div>
   )
 }
@@ -903,6 +905,13 @@ function BasicInfo({ profile }: { profile: any }) {
     { label: '开户行', value: profile.bankName || '未填写' },
     { label: '银行账号', value: profile.bankAccount || '未填写' },
     { label: '状态', value: profile.status === 'ACTIVE' ? '在职' : '离职' },
+    ...(profile.status !== 'ACTIVE' && profile.terminations && profile.terminations.length > 0
+      ? [{ label: '离职日期', value: profile.terminations
+          .map((t: any) => t.terminationDate?.toString().slice(0, 10))
+          .filter(Boolean)
+          .sort()
+          .reverse()[0] || '未记录' }]
+      : []),
   ]
   const special = [
     { label: '孕期', value: profile.isPregnant },
@@ -2808,6 +2817,17 @@ function EvidenceChain({ employeeId }: { employeeId: string }) {
     URL.revokeObjectURL(url)
   }
 
+  const riskStyle: Record<string, string> = {
+    DANGER: 'bg-red-50 border-red-300 text-red-700',
+    HIGH: 'bg-orange-50 border-orange-300 text-orange-700',
+    MEDIUM: 'bg-amber-50 border-amber-300 text-amber-700',
+  }
+  const riskIcon: Record<string, string> = {
+    DANGER: '🔴',
+    HIGH: '🟠',
+    MEDIUM: '🟡',
+  }
+
   return (
     <div className="space-y-3">
       <Card>
@@ -2831,14 +2851,41 @@ function EvidenceChain({ employeeId }: { employeeId: string }) {
               <div className="text-gray-500">未签字</div>
               <div className="text-xl font-bold text-warning">{data.summary.unsigned}</div>
             </div>
+            {data.summary.riskCount > 0 && (
+              <div className="text-xs text-center">
+                <div className="text-gray-500">风险项</div>
+                <div className="text-xl font-bold text-danger">{data.summary.riskCount}</div>
+              </div>
+            )}
             <Button onClick={handleExport}>导出证据链</Button>
           </div>
         </div>
       </Card>
 
+      {data.risks && data.risks.length > 0 && (
+        <Card>
+          <h3 className="text-xs font-medium mb-3 flex items-center gap-2">
+            <AlertTriangle className="w-4 h-4 text-danger" />
+            风险提醒（{data.risks.length}项）
+          </h3>
+          <div className="space-y-2">
+            {data.risks.map((r: any, i: number) => (
+              <div key={i} className={`border rounded-lg p-3 ${riskStyle[r.level] || 'bg-gray-50 border-gray-200 text-gray-600'}`}>
+                <div className="flex items-center gap-2">
+                  <span>{riskIcon[r.level] || '⚠'}</span>
+                  <span className="font-medium text-xs">{r.title}</span>
+                  <span className="text-xs opacity-70">{r.category}</span>
+                </div>
+                <div className="text-xs mt-1 opacity-90">{r.description}</div>
+              </div>
+            ))}
+          </div>
+        </Card>
+      )}
+
       <div className="space-y-2">
         {data.evidence.map((e: any, i: number) => (
-          <Card key={i}>
+          <Card key={i} className={e.riskLevel === 'HIGH' ? 'border-orange-300' : ''}>
             <div className="flex items-start gap-3">
               <span className={`px-2 py-0.5 rounded border text-xs shrink-0 ${categoryColor[e.category] || 'bg-gray-50 text-gray-600 border-gray-200'}`}>
                 {e.category}
@@ -2849,6 +2896,7 @@ function EvidenceChain({ employeeId }: { employeeId: string }) {
                   <span className="text-xs text-gray-400">{e.date}</span>
                   {e.acknowledged === true && <span className="text-xs text-safe">✓ 已签字</span>}
                   {e.acknowledged === false && <span className="text-xs text-warning">⚠ 未签字</span>}
+                  {e.riskLevel === 'HIGH' && <span className="text-xs text-danger">⚠ 高风险</span>}
                 </div>
                 <div className="text-xs text-gray-600 mt-1">{e.description}</div>
               </div>