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）

backend/src/routes/settings.routes.ts

@@ -27,7 +27,7 @@ router.get('/org', async (req: AuthRequest, res, next) => {
   try {
     const org = await prisma.organization.findUnique({
       where: { id: req.user!.orgId },
-      select: { id: true, name: true, plan: true, maxEmployees: true, createdAt: true },
+      select: { id: true, name: true, plan: true, maxEmployees: true, city: true, contactName: true, contactPhone: true, payrollFrequency: true, createdAt: true },
     })
     res.json({ success: true, data: org })
   } catch (err) {
@@ -38,14 +38,17 @@ router.get('/org', async (req: AuthRequest, res, next) => {
 // 更新企业信息
 router.put('/org', requireAdmin, async (req: AuthRequest, res, next) => {
   try {
-    const { name, payrollFrequency } = req.body as { name?: string; payrollFrequency?: number }
+    const { name, payrollFrequency, city, contactName, contactPhone } = req.body as { name?: string; payrollFrequency?: number; city?: string; contactName?: string; contactPhone?: string }
     const updateData: any = {}
     if (name) updateData.name = name
     if (payrollFrequency !== undefined) updateData.payrollFrequency = payrollFrequency
+    if (city !== undefined) updateData.city = city
+    if (contactName !== undefined) updateData.contactName = contactName
+    if (contactPhone !== undefined) updateData.contactPhone = contactPhone
     const org = await prisma.organization.update({
       where: { id: req.user!.orgId },
       data: updateData,
-      select: { id: true, name: true, plan: true, maxEmployees: true, payrollFrequency: true },
+      select: { id: true, name: true, plan: true, maxEmployees: true, city: true, contactName: true, contactPhone: true, payrollFrequency: true },
     })
     res.json({ success: true, data: org })
   } catch (err) {