fix off product sku for keep fulfillment

src/pages/product/component/ProductSkuUnitEditor.vue

@@ -28,7 +28,15 @@
 				<div v-for="(unit, unitIndex) in sku.unitList" :key="unit.clientKey" class="unit-card">
 					<div class="unit-card-header">
 						<strong v-text="`单位 ${unitIndex + 1}`" />
-						<t-button v-if="1 < sku.unitList.length" theme="danger" variant="text" size="extra-small" content="删除" @click="removeUnit(unitIndex)" />
+					<t-button
+						v-if="1 < sku.unitList.length"
+						theme="danger"
+						variant="text"
+						size="extra-small"
+						:content="unit.id ? '停售' : '删除'"
+						:disabled="!!unit.id && unit.allowSale === false && unit.allowPurchase === false"
+						@click="removeUnit(unitIndex)"
+					/>
 					</div>
 					<t-form class="unit-form" label-align="left" label-width="6rem">
 						<t-form-item label="单位名称" required-mark>
@@ -134,6 +142,13 @@ function removeUnit(index: number): void {
 		Message.warning("每个 SKU 至少需要一个单位");
 		return;
 	}
+	const unit = sku.value.unitList[index];
+	if (unit?.id) {
+		unit.allowSale = false;
+		unit.allowPurchase = false;
+		Message.success("单位已停售并禁止采购，历史订单仍可履约");
+		return;
+	}
 	const wasBase = sku.value.unitList[index]?.isBase;
 	sku.value.unitList.splice(index, 1);
 	if (wasBase && sku.value.unitList[0]) {