feat: 节假日配置、排班管理独立页面、考勤加班显示优化

- 新增 HolidayConfig 模型，支持法定节假日和调休工作日配置
- 加班费同步逻辑改用 HolidayConfig 判断日期类型
- 员工端考勤显示加班工时、费率和日期类型
- 周末/节假日出勤状态显示为"周末出勤"/"节假日出勤"
- 新增 Employee.defaultShiftId 字段，支持长期排班（工作日班次）
- 排班管理拆分为独立页面（班次管理+排班），考勤管理保留出勤相关功能
- 排班和每日出勤页面增加身份证号列
- 修复岗位和部门编辑失败问题（POST 改 PUT）
- 新增 backfill 脚本：合同薪资回填、默认班次回填

Generated with [Devin](https://devin.ai)

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

backend/scripts/backfill-contract-salary.ts

@@ -0,0 +1,67 @@
+/**
+ * 迁移脚本：将员工月工资复制到合同的 baseSalary
+ * 当合同 baseSalary=0 且 performanceSalary=0 时，用员工 monthlySalary 填充 baseSalary
+ * 月工资 = baseSalary + performanceSalary
+ */
+import prisma from '../src/lib/prisma'
+import { decrypt } from '../src/lib/crypto'
+
+async function main() {
+  const contracts = await prisma.laborContract.findMany({
+    where: {
+      baseSalary: 0,
+      performanceSalary: 0,
+    },
+    include: {
+      employee: {
+        select: { monthlySalary: true, baseSalary: true, performanceSalary: true },
+      },
+    },
+  })
+
+  console.log(`找到 ${contracts.length} 个合同 baseSalary=0 且 performanceSalary=0`)
+
+  let updated = 0
+  for (const contract of contracts) {
+    const emp = contract.employee
+    if (!emp?.monthlySalary) continue
+
+    let empBase = 0
+    let empPerf = 0
+    try {
+      empBase = emp.baseSalary ? Number(decrypt(emp.baseSalary)) || 0 : 0
+      empPerf = emp.performanceSalary ? Number(decrypt(emp.performanceSalary)) || 0 : 0
+    } catch {}
+
+    // 优先用员工的 baseSalary/performanceSalary
+    let newBase = empBase
+    let newPerf = empPerf
+
+    // 如果员工也没有拆分工资，用 monthlySalary 作为 baseSalary
+    if (newBase === 0 && newPerf === 0) {
+      let monthly = 0
+      try {
+        monthly = Number(decrypt(emp.monthlySalary)) || 0
+      } catch {}
+      if (monthly > 0) {
+        newBase = monthly
+        newPerf = 0
+      }
+    }
+
+    if (newBase > 0 || newPerf > 0) {
+      await prisma.laborContract.update({
+        where: { id: contract.id },
+        data: { baseSalary: newBase, performanceSalary: newPerf },
+      })
+      console.log(`  ✓ 合同 ${contract.id} (员工 ${contract.employeeId}): base=${newBase}, perf=${newPerf}`)
+      updated++
+    }
+  }
+
+  console.log(`\n完成：共更新 ${updated} 个合同`)
+}
+
+main()
+  .catch(console.error)
+  .finally(() => prisma.$disconnect())