feat: 完成优化-4全部任务 + 多城市社保 + pgvector修复

- AIAssistant: 会话历史保存/加载/删除，风险预测支持范围筛选，审查结果保存到员工档案
- Dashboard: 待办批量操作，风险分布可下钻，刷新按钮Tab级联，薪税tab导出Excel
- SocialInsurance: 多城市社保/公积金配置支持，城市选择器
- Roster: 新增参保城市字段
- risk.service: 修复风险项去重逻辑(用employeeId:type:actionUrl替代含动态天数的title)
- payroll.routes: 修复OvertimeRecord/Payslip字段名错误
- pgvector: 从源码编译安装x86_64版本兼容postgresql@15
- 优化-4文档: 全部8项标记为已完成

backend/src/routes/export.routes.ts

@@ -2,6 +2,7 @@ import { Router, Response } from 'express'
 import { authMiddleware, AuthRequest } from '../middleware/auth'
 import prisma from '../lib/prisma'
 import { decrypt } from '../lib/crypto'
+import ExcelJS from 'exceljs'
 
 const router = Router()
 
@@ -49,4 +50,87 @@ router.get('/all', authMiddleware, async (req: AuthRequest, res: Response, next)
   }
 })
 
+// 导出本月薪税汇总 Excel
+router.get('/payroll', authMiddleware, async (req: AuthRequest, res: Response, next) => {
+  try {
+    const orgId = req.user!.orgId
+    const month = (req.query.month as string) || new Date().toISOString().slice(0, 7)
+
+    const entries = await prisma.batchEntry.findMany({
+      where: { orgId, batch: { month, status: 'ARCHIVED' } },
+      include: { employee: true, batch: true },
+      orderBy: { employee: { name: 'asc' } },
+    })
+
+    const workbook = new ExcelJS.Workbook()
+    const ws = workbook.addWorksheet('薪税汇总')
+
+    ws.columns = [
+      { header: '员工姓名', key: 'name', width: 12 },
+      { header: '部门', key: 'department', width: 15 },
+      { header: '基本工资', key: 'baseSalary', width: 12 },
+      { header: '加班费', key: 'overtimePay', width: 12 },
+      { header: '津贴补贴', key: 'allowance', width: 12 },
+      { header: '奖金', key: 'bonus', width: 12 },
+      { header: '扣款', key: 'deduction', width: 12 },
+      { header: '应发合计', key: 'totalPay', width: 12 },
+      { header: '个人社保', key: 'socialEmp', width: 12 },
+      { header: '个人公积金', key: 'housingEmp', width: 12 },
+      { header: '个人所得税', key: 'tax', width: 12 },
+      { header: '实发工资', key: 'netPay', width: 12 },
+      { header: '企业社保', key: 'socialOrg', width: 12 },
+      { header: '企业公积金', key: 'housingOrg', width: 12 },
+      { header: '企业总成本', key: 'orgCost', width: 12 },
+    ]
+
+    ws.getRow(1).font = { bold: true }
+
+    for (const e of entries) {
+      ws.addRow({
+        name: e.employee.name,
+        department: e.employee.department,
+        baseSalary: e.baseSalary,
+        overtimePay: e.overtimePay,
+        allowance: e.allowance,
+        bonus: e.bonus,
+        deduction: e.deduction,
+        totalPay: e.totalPay,
+        socialEmp: e.socialEmp,
+        housingEmp: e.housingEmp,
+        tax: e.tax,
+        netPay: e.netPay,
+        socialOrg: e.socialOrg,
+        housingOrg: e.housingOrg,
+        orgCost: e.totalPay + e.socialOrg + e.housingOrg,
+      })
+    }
+
+    // 汇总行
+    const totalRow = ws.addRow({
+      name: '合计',
+      baseSalary: { formula: `SUM(C2:C${entries.length + 1})` },
+      overtimePay: { formula: `SUM(D2:D${entries.length + 1})` },
+      allowance: { formula: `SUM(E2:E${entries.length + 1})` },
+      bonus: { formula: `SUM(F2:F${entries.length + 1})` },
+      deduction: { formula: `SUM(G2:G${entries.length + 1})` },
+      totalPay: { formula: `SUM(H2:H${entries.length + 1})` },
+      socialEmp: { formula: `SUM(I2:I${entries.length + 1})` },
+      housingEmp: { formula: `SUM(J2:J${entries.length + 1})` },
+      tax: { formula: `SUM(K2:K${entries.length + 1})` },
+      netPay: { formula: `SUM(L2:L${entries.length + 1})` },
+      socialOrg: { formula: `SUM(M2:M${entries.length + 1})` },
+      housingOrg: { formula: `SUM(N2:N${entries.length + 1})` },
+      orgCost: { formula: `SUM(O2:O${entries.length + 1})` },
+    })
+    totalRow.font = { bold: true }
+
+    res.setHeader('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet')
+    res.setHeader('Content-Disposition', `attachment; filename="payroll-${month}.xlsx"`)
+    await workbook.xlsx.write(res)
+    res.end()
+  } catch (err) {
+    next(err)
+  }
+})
+
 export default router