feat: 20260809 系统优化 - 全部28项问题修复(P0×6+P1×16+P2×6)

P0: 福利批量参保/离职证明下载防乱码/考勤模板合并Sheet/补卡修改/附件在线查看删除
P1: 分页pageSize修复/离职导出筛选/撤回删除草稿/加班费自动计算/考勤加班汇总/证据链异常详情/制度催办/模板导入Word/社保封顶保底/校验字段提示/职务字段/社保费用明细/弹窗防误关/身份证查重/证明员工下拉/培训批量
P2: 离职流程去重/社保基数覆盖输入/薪税入口改名/添加员工引导/绩效模板清理

backend/src/routes/export.routes.ts

@@ -359,9 +359,16 @@ router.get('/terminations', authMiddleware, async (req: AuthRequest, res: Respon
     const status = req.query.status as string | undefined
     const department = req.query.department as string | undefined
     const search = req.query.search as string | undefined
+    const dateFrom = req.query.dateFrom as string | undefined
+    const dateTo = req.query.dateTo as string | undefined
 
     const where: any = { orgId }
     if (status) where.status = status
+    if (dateFrom || dateTo) {
+      where.terminationDate = {}
+      if (dateFrom) where.terminationDate.gte = new Date(dateFrom)
+      if (dateTo) where.terminationDate.lte = new Date(dateTo + 'T23:59:59')
+    }
     if (department || search) {
       where.employee = {}
       if (department) where.employee.department = department