fix: 修复 Settlement 类型字段名称不匹配

- orderAmount → totalAmount
- settlementAmount → actualAmount
- settledAt → paidAt

与 @rent/shared-types 中的类型定义保持一致

apps/merchant-admin/src/pages/finance/Settlements.tsx

@@ -213,21 +213,21 @@ const Settlements: React.FC = () => {
               {detailModal.data.periodStart} ~ {detailModal.data.periodEnd}
             </Descriptions.Item>
             <Descriptions.Item label="订单数量">{detailModal.data.orderCount} 笔</Descriptions.Item>
-            <Descriptions.Item label="订单总额">{formatMoney(detailModal.data.orderAmount)}</Descriptions.Item>
+            <Descriptions.Item label="订单总额">{formatMoney(detailModal.data.totalAmount)}</Descriptions.Item>
             <Descriptions.Item label="平台服务费">
               <span style={{ color: '#ff4d4f' }}>{formatMoney(detailModal.data.serviceFee)}</span>
             </Descriptions.Item>
             <Descriptions.Item label="结算金额">
               <span style={{ fontWeight: 'bold', color: '#52c41a' }}>
-                {formatMoney(detailModal.data.settlementAmount)}
+                {formatMoney(detailModal.data.actualAmount)}
               </span>
             </Descriptions.Item>
             <Descriptions.Item label="状态">
               <SettlementStatusTag status={detailModal.data.status} />
             </Descriptions.Item>
             <Descriptions.Item label="创建时间">{formatDateTime(detailModal.data.createdAt)}</Descriptions.Item>
-            {detailModal.data.settledAt && (
-              <Descriptions.Item label="结算时间">{formatDateTime(detailModal.data.settledAt)}</Descriptions.Item>
+            {detailModal.data.paidAt && (
+              <Descriptions.Item label="结算时间">{formatDateTime(detailModal.data.paidAt)}</Descriptions.Item>
             )}
           </Descriptions>
         )}