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/payroll.routes.ts

@@ -129,6 +129,88 @@ router.put('/overtime/:id', async (req: AuthRequest, res: Response, next: NextFu
   }
 })
 
+// 从考勤记录同步加班工时
+router.post('/overtime/sync-from-attendance', async (req: AuthRequest, res: Response, next: NextFunction) => {
+  try {
+    const orgId = req.user!.orgId
+    const { month } = req.body as { month: string }
+    if (!month || !/^\d{4}-\d{2}$/.test(month)) {
+      return res.status(400).json({ success: false, message: '请提供有效的月份（YYYY-MM）' })
+    }
+
+    const monthStart = new Date(month + '-01')
+    const monthEnd = new Date(monthStart)
+    monthEnd.setMonth(monthEnd.getMonth() + 1)
+
+    // 获取该月所有考勤记录（含加班工时）
+    const records = await prisma.attendanceRecord.findMany({
+      where: { orgId, date: { gte: monthStart, lt: monthEnd }, overtimeHours: { gt: 0 } },
+    })
+
+    if (records.length === 0) {
+      return res.json({ success: false, message: '该月考勤记录中无加班工时' })
+    }
+
+    // 按员工汇总加班工时，按日期类型分类
+    const empMap = new Map<string, { weekday: number; weekend: number; holiday: number }>()
+    for (const r of records) {
+      const day = new Date(r.date)
+      const dayOfWeek = day.getDay() // 0=周日, 6=周六
+      let type: 'weekday' | 'weekend' | 'holiday' = 'weekday'
+      if (dayOfWeek === 0 || dayOfWeek === 6) {
+        type = 'weekend'
+      }
+      // 简单判断法定节假日：这里使用周末判断，实际法定节假日需要额外配置
+      // 如果有 holidayHours 字段在 attendanceRecord 中，优先使用
+
+      if (!empMap.has(r.employeeId)) {
+        empMap.set(r.employeeId, { weekday: 0, weekend: 0, holiday: 0 })
+      }
+      const entry = empMap.get(r.employeeId)!
+      entry[type] += r.overtimeHours || 0
+    }
+
+    // 获取员工月工资用于计算加班费
+    let config = await prisma.overtimeConfig.findUnique({ where: { orgId } })
+    if (!config) config = await prisma.overtimeConfig.create({ data: { orgId } })
+
+    let synced = 0
+    for (const [employeeId, hours] of empMap) {
+      const emp = await prisma.employee.findFirst({ where: { id: employeeId }, select: { monthlySalary: true } })
+      let monthlyWage = 0
+      try { monthlyWage = emp?.monthlySalary ? Number(decrypt(emp.monthlySalary)) : 0 } catch { monthlyWage = Number(emp?.monthlySalary) || 0 }
+
+      const hourlyWage = monthlyWage / config.monthlyDays / config.dailyHours
+      const weekdayPay = hourlyWage * config.weekdayRate * hours.weekday
+      const weekendPay = hourlyWage * config.weekendRate * hours.weekend
+      const holidayPay = hourlyWage * config.holidayRate * hours.holiday
+      const totalPay = weekdayPay + weekendPay + holidayPay
+
+      await prisma.overtimeRecord.upsert({
+        where: { employeeId_month: { employeeId, month } },
+        update: {
+          weekdayHours: hours.weekday,
+          weekendHours: hours.weekend,
+          holidayHours: hours.holiday,
+          weekdayPay, weekendPay, holidayPay, totalPay,
+        },
+        create: {
+          orgId, employeeId, month,
+          weekdayHours: hours.weekday,
+          weekendHours: hours.weekend,
+          holidayHours: hours.holiday,
+          weekdayPay, weekendPay, holidayPay, totalPay,
+        },
+      })
+      synced++
+    }
+
+    res.json({ success: true, data: { synced, totalEmployees: empMap.size } })
+  } catch (err) {
+    next(err)
+  }
+})
+
 // ========== 工资条管理 ==========
 
 const payslipSchema = z.object({