fix: HR系统优化批次1 - P0/P1问题修复

P0-3: 修复合同状态判断逻辑，有合同记录但signDate为null时不再误判未签
P0-5: 修复参保城市默认北京问题，导入和预览均改为null
P0-11: 添加全局ErrorBoundary防止白屏，三处布局均包裹
P1-2: 合同附件改为可选，允许先保存再补充上传
P1-7.2: 排班弹窗增加员工搜索（姓名/部门）
P1-8.2: 加班费导入支持Excel(xlsx/xls)格式，兼容中英文列名
P1-9: 社保/公积金基数月度办理支持逐人修改，后端返回recordId

frontend/src/pages/Money.tsx

@@ -2,6 +2,7 @@ import { useState, useRef } from 'react'
 import { toast } from 'sonner'
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
 import { useConfirm } from '../hooks/useConfirm'
+import * as XLSX from 'xlsx'
 import { Calculator, AlertCircle, Info, Check, Upload, Layers, Settings as SettingsIcon, Archive, Plus, Trash2, AlertTriangle, Download, FileText, X, ChevronLeft, Wallet, LayoutTemplate, Clock, Receipt, Users, TrendingDown, TrendingUp, BadgeCheck } from 'lucide-react'
 import api from '../lib/api'
 import { useAuthStore } from '../store/authStore'
@@ -1527,34 +1528,70 @@ function OvertimeCalculator() {
   const handleFileUpload = (e: React.ChangeEvent<HTMLInputElement>) => {
     const file = e.target.files?.[0]
     if (!file) return
-    const reader = new FileReader()
-    reader.onload = (event) => {
-      const text = event.target?.result as string
-      const lines = text.split('\n').filter(l => l.trim())
+    const empList = employees?.items || []
+    const fileName = file.name.toLowerCase()
+
+    const parseRows = (rows: any[]): void => {
       const items: any[] = []
-      const empList = employees?.items || []
-      for (let i = 1; i < lines.length; i++) {
-        const cols = lines[i].split(',').map(c => c.trim())
-        const empName = cols[0]
+      for (let i = 0; i < rows.length; i++) {
+        const row = rows[i]
+        // 兼容中文列名和英文列名
+        const empName = String(row['姓名'] ?? row['name'] ?? row['姓名*'] ?? '').trim()
+        if (!empName) continue
         const emp = empList.find(e => e.name === empName)
         if (!emp) continue
         items.push({
           employeeId: emp.id,
           employeeName: emp.name,
           department: emp.department,
-          month: cols[4] || month,
-          weekdayHours: Number(cols[1]) || 0,
-          weekendHours: Number(cols[2]) || 0,
-          holidayHours: Number(cols[3]) || 0,
+          month: String(row['月份'] ?? row['month'] ?? '').trim() || month,
+          weekdayHours: Number(row['工作日加班时长'] ?? row['weekdayHours'] ?? row['工作日'] ?? 0) || 0,
+          weekendHours: Number(row['休息日加班时长'] ?? row['weekendHours'] ?? row['休息日'] ?? 0) || 0,
+          holidayHours: Number(row['法定节假日加班时长'] ?? row['holidayHours'] ?? row['法定节假日'] ?? 0) || 0,
         })
       }
       if (items.length > 0) {
         setPreviewData(items)
       } else {
-        toast.error('未匹配到员工，请确保CSV第一列为员工姓名')
+        toast.error('未匹配到员工，请确保文件包含"姓名"列')
       }
     }
-    reader.readAsText(file)
+
+    if (fileName.endsWith('.xlsx') || fileName.endsWith('.xls')) {
+      // Excel 格式解析
+      const reader = new FileReader()
+      reader.onload = (event) => {
+        try {
+          const data = new Uint8Array(event.target?.result as ArrayBuffer)
+          const wb = XLSX.read(data, { type: 'array' })
+          const ws = wb.Sheets[wb.SheetNames[0]]
+          const rows = XLSX.utils.sheet_to_json(ws)
+          parseRows(rows)
+        } catch {
+          toast.error('Excel 文件解析失败')
+        }
+      }
+      reader.readAsArrayBuffer(file)
+    } else {
+      // CSV 格式解析（保持兼容）
+      const reader = new FileReader()
+      reader.onload = (event) => {
+        const text = event.target?.result as string
+        const lines = text.split('\n').filter(l => l.trim())
+        if (lines.length < 2) { toast.error('CSV 文件内容为空'); return }
+        // 解析表头
+        const headers = lines[0].split(',').map(c => c.trim())
+        const rows: any[] = []
+        for (let i = 1; i < lines.length; i++) {
+          const cols = lines[i].split(',').map(c => c.trim())
+          const row: any = {}
+          headers.forEach((h, idx) => { row[h] = cols[idx] ?? '' })
+          rows.push(row)
+        }
+        parseRows(rows)
+      }
+      reader.readAsText(file)
+    }
   }
 
   const confirmImport = () => {