feat: 预入职状态+入职手续待办

1. 花名册动态状态：hireDate > today 显示「预入职」(蓝色标签)
2. RiskType 增加 ONBOARDING 枚举
3. 新增 detectOnboardingRisks：入职日期到但未签合同→生成待办
4. detectContractRisks 排除预入职员工（未到入职日期不检查合同）
5. Dashboard 风险提醒 tab 支持 ONBOARDING 待办类型
6. 前端类型定义同步更新

backend/prisma/schema.prisma

@@ -42,6 +42,7 @@ enum RiskType {
   SALARY
   TERMINATION
   MONTHLY
+  ONBOARDING
 }
 
 enum RiskLevel {

backend/src/routes/roster.routes.ts

@@ -58,11 +58,13 @@ router.get('/', authMiddleware, async (req: AuthRequest, res, next) => {
             contractType: 'UNSIGNED',
             hireDate: e.hireDate,
           })
+      const isResigned = e.terminations.some((t) => t.terminationDate <= today)
+      const isPreHire = !isResigned && e.hireDate > today
       return {
         id: e.id,
         name: e.name,
         department: e.department,
-        status: e.terminations.some((t) => t.terminationDate <= today) ? 'RESIGNED' : 'ACTIVE',
+        status: isResigned ? 'RESIGNED' : (isPreHire ? 'PRE_HIRE' : 'ACTIVE'),
         hasTermination: e.terminations.length > 0,
         latestTerminationDate: e.terminations[0]?.terminationDate || null,
         latestTerminationType: e.terminations[0]?.type || null,

backend/src/services/risk.service.ts

@@ -7,8 +7,10 @@ function daysBetween(a: Date, b: Date): number {
 }
 
 export async function detectContractRisks(orgId: string) {
+  const today = new Date()
+  today.setHours(0, 0, 0, 0)
   const employees = await prisma.employee.findMany({
-    where: { orgId, status: 'ACTIVE' },
+    where: { orgId, status: 'ACTIVE', hireDate: { lte: today } },
     include: { contracts: { orderBy: { createdAt: 'desc' } } },
   })
 
@@ -98,6 +100,43 @@ export async function detectContractRisks(orgId: string) {
   return risks
 }
 
+// 预入职检查：入职日期已到但未签合同 → 待办
+export async function detectOnboardingRisks(orgId: string) {
+  const today = new Date()
+  today.setHours(0, 0, 0, 0)
+  const employees = await prisma.employee.findMany({
+    where: { orgId, status: 'ACTIVE', hireDate: { lte: today } },
+    include: {
+      contracts: { orderBy: { createdAt: 'desc' }, take: 1 },
+      terminations: { where: { terminationDate: { lte: today } }, take: 1 },
+    },
+  })
+
+  const risks: { employeeId: string; type: RiskType; level: RiskLevel; title: string; description: string; actionUrl: string }[] = []
+
+  for (const emp of employees) {
+    // 已离职的跳过
+    if (emp.terminations.length > 0) continue
+
+    const latestContract = emp.contracts[0]
+    const hasSignedContract = latestContract && latestContract.contractType !== 'UNSIGNED'
+
+    if (!hasSignedContract) {
+      const daysSinceHire = daysBetween(today, emp.hireDate)
+      risks.push({
+        employeeId: emp.id,
+        type: 'ONBOARDING',
+        level: daysSinceHire > 30 ? 'HIGH' : 'MEDIUM',
+        title: `${emp.name}入职手续未完成${daysSinceHire > 30 ? `（已超${daysSinceHire}天）` : ''}`,
+        description: `入职日期 ${emp.hireDate.toISOString().slice(0, 10)}，尚未签订劳动合同，请尽快完成入职手续。`,
+        actionUrl: `/roster?employee=${encodeURIComponent(emp.name)}`,
+      })
+    }
+  }
+
+  return risks
+}
+
 export async function detectTerminationRisks(orgId: string) {
   const employees = await prisma.employee.findMany({
     where: { orgId, status: 'ACTIVE' },
@@ -206,10 +245,11 @@ export async function runRiskDetection(orgId: string) {
 
   const contractRisks = await detectContractRisks(orgId)
   const terminationRisks = await detectTerminationRisks(orgId)
+  const onboardingRisks = await detectOnboardingRisks(orgId)
   const monthlyTasks = await detectMonthlyTasks(orgId)
 
   // 月度任务用 monthlyKeys 去重，其他任务用 existingKeys 去重
-  const nonMonthlyRisks = [...contractRisks, ...terminationRisks]
+  const nonMonthlyRisks = [...contractRisks, ...terminationRisks, ...onboardingRisks]
   const toCreate = [
     ...nonMonthlyRisks.filter((r) => !existingKeys.has(`${r.employeeId}:${r.title}`)),
     ...monthlyTasks.filter((r) => !monthlyKeys.has(`${r.employeeId}:${r.title}`)),