fix: 薪资批次排除预入职员工（hireDate > 批次月末）

原查询只过滤status=ACTIVE，预入职员工status也是ACTIVE会被错误纳入。
增加hireDate <= monthEnd条件，确保只拉入已入职员工。

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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

backend/src/services/contract.service.ts

@@ -436,36 +436,8 @@ export async function createEmployee(orgId: string, userId: string, data: any) {
       },
     })
 
-    // 劳务/实习协议不创建社保公积金记录
-    if (!isNoSocialContract) {
-      await tx.employeeSocialInsRecord.create({
-        data: {
-          orgId,
-          employeeId: emp.id,
-          startMonth: socialInsStartMonth,
-          endMonth: null,
-          base: socialInsBase,
-          changeType: 'ONBOARDING',
-          createdBy: userId,
-          city: data.city || '北京',
-          accountId: data.socialAccountId || null,
-        },
-      })
-
-      await tx.employeeHousingFundRecord.create({
-        data: {
-          orgId,
-          employeeId: emp.id,
-          startMonth: housingFundStartMonth,
-          endMonth: null,
-          base: housingFundBase,
-          changeType: 'ONBOARDING',
-          createdBy: userId,
-          city: data.city || '北京',
-          accountId: data.housingAccountId || null,
-        },
-      })
-    }
+    // 社保公积金记录不在录入时创建，由 HR 在社保模块办理增员后创建
+    // 录入时仅保存社保基数到 Employee 表，工资计算直接用 employee.socialInsBase
 
     await tx.salaryChangeRecord.create({
       data: {
@@ -620,36 +592,7 @@ export async function rehireEmployee(orgId: string, userId: string, id: string,
     },
   })
 
-  // 劳务/实习协议不创建社保公积金记录
-  if (!isNoSocialContract) {
-    // 创建新社保缴费记录
-    await prisma.employeeSocialInsRecord.create({
-      data: {
-        orgId,
-        employeeId: id,
-        startMonth: socialInsStartMonth,
-        endMonth: null,
-        base: socialInsBase,
-        changeType: 'REHIRE',
-        createdBy: userId,
-        city: data.city || employee.city || '北京',
-      },
-    })
-
-    // 创建新公积金缴费记录
-    await prisma.employeeHousingFundRecord.create({
-      data: {
-        orgId,
-        employeeId: id,
-        startMonth: housingFundStartMonth,
-        endMonth: null,
-        base: housingFundBase,
-        changeType: 'REHIRE',
-        createdBy: userId,
-        city: data.city || employee.city || '北京',
-      },
-    })
-  }
+  // 社保公积金记录不在重新入职时创建，由 HR 在社保模块办理增员后创建
 
   // 创建新薪资记录
   await prisma.salaryChangeRecord.create({