feat: 分页组件、Dashboard待办图标、归档与工资条解耦、总览数据优化

- 新增公用 Pagination 组件，Roster/Money/Dashboard 列表加分页
- Dashboard 待办按类型显示不同图标（合同/薪资/解聘/月度）
- 待办分为「风险提醒」「月度任务」两个顶层 tab
- 归档与工资条生成解耦：归档只锁定批次，工资条单独生成
- 工资条管理新增「从批次汇总生成」按钮
- Dashboard 总览优先从已归档批次 BatchEntry 汇总数据
- 新增工资条生成待办提醒，生成后自动标记完成
- 修复高风险统计只含 CONTRACT/TERMINATION 类型
- 修复月度任务去重逻辑覆盖 SALARY 类型

frontend/src/pages/portal/Payslip.tsx

@@ -7,6 +7,9 @@ import Card from '../../components/ui/Card'
 import Button from '../../components/ui/Button'
 import EmptyState from '../../components/ui/EmptyState'
 
+// 金额格式化：保留两位小数 + 千分位
+const fmt = (n: number) => (n || 0).toLocaleString('zh-CN', { minimumFractionDigits: 2, maximumFractionDigits: 2 })
+
 const portalApi = api.create({ baseURL: '/api/v1/portal' })
 portalApi.interceptors.request.use((config: any) => {
   const token = localStorage.getItem('portalToken')
@@ -65,32 +68,32 @@ export default function Payslip() {
             <div className="space-y-3">
               <div className="flex justify-between text-sm">
                 <span className="text-gray-500">基本工资</span>
-                <span className="font-medium">¥{Number(data.baseSalary).toLocaleString()}</span>
+                <span className="font-medium">¥{fmt(Number(data.baseSalary))}</span>
               </div>
               {data.overtimePay > 0 && (
                 <div className="space-y-1">
                   <div className="flex justify-between text-sm">
                     <span className="text-gray-500">加班费</span>
-                    <span className="font-medium">¥{Number(data.overtimePay).toLocaleString()}</span>
+                    <span className="font-medium">¥{fmt(Number(data.overtimePay))}</span>
                   </div>
                 </div>
               )}
               {data.allowance > 0 && (
                 <div className="flex justify-between text-sm">
                   <span className="text-gray-500">津贴</span>
-                  <span className="font-medium">¥{Number(data.allowance).toLocaleString()}</span>
+                  <span className="font-medium">¥{fmt(Number(data.allowance))}</span>
                 </div>
               )}
               {data.deduction > 0 && (
                 <div className="flex justify-between text-sm">
                   <span className="text-gray-500">扣款</span>
-                  <span className="font-medium text-danger">-¥{Number(data.deduction).toLocaleString()}</span>
+                  <span className="font-medium text-danger">-¥{fmt(Number(data.deduction))}</span>
                 </div>
               )}
               <div className="border-t pt-3">
                 <div className="flex justify-between">
                   <span className="font-medium">应发合计</span>
-                  <span className="text-xl font-bold text-primary">¥{Number(data.totalPay).toLocaleString()}</span>
+                  <span className="text-xl font-bold text-primary">¥{fmt(Number(data.totalPay))}</span>
                 </div>
               </div>