feat(web-admin): make plan stop contract selector single-choice

Co-authored-by: Cursor <cursoragent@cursor.com>

web-admin/src/components/business/pl-plan-contract-multi-select/index.vue

@@ -132,7 +132,10 @@
         <p v-else class="pl-plan-contract-card__empty">暂无产品明细</p>
       </article>
     </div>
-    <p v-else-if="readonly || customerId" class="pl-plan-contract-panel__empty-hint">
+    <p
+      v-else-if="readonly || (customerId && !disabled)"
+      class="pl-plan-contract-panel__empty-hint"
+    >
       {{ readonly ? '暂无关联合同' : '暂未选择合同' }}
     </p>
 
@@ -141,10 +144,8 @@
       v-model:visible="selectorVisible"
       :customer-id="customerId"
       :selectable-statuses="selectableStatuses"
-      multiple
-      :selected-ids="selectedIds"
       hide-amount
-      @confirm-multiple="handleConfirmMultiple"
+      @confirm="handleConfirmSingle"
     />
 
     <ContractDetailDialog ref="contractDetailRef" hide-product-price />
@@ -159,6 +160,7 @@ import { fetchProductDetail } from '@/api/crm/product'
 import ContractSelector from '@/components/business/contract-selector/index.vue'
 import DictTag from '@/components/DictTag/index.vue'
 import { applyAliasDisplayMeta, formatBrandConstraintLabel } from '@/utils/crm-product-brand'
+import { collectContractProductIds } from '@/utils/pl-plan-contract-product'
 
 const ContractDetailDialog = defineAsyncComponent(
   () => import('@/views/crm/contract/components/ContractDetailDialog.vue')
@@ -242,14 +244,19 @@ const selectedIds = computed(() =>
 
 const triggerDisabled = computed(() => props.disabled || !props.customerId)
 
-const hintWarn = computed(
-  () => !!props.customerId && props.required && !selectedIds.value.length
-)
+const hintWarn = computed(() => {
+  if (!props.customerId) return false
+  if (selectedIds.value.length > 1) return true
+  return !!props.required && !selectedIds.value.length
+})
 
 const hintText = computed(() => {
   if (!props.customerId) return '请先选择客户'
-  if (hintWarn.value) return '请至少选择一份合同'
-  if (selectedIds.value.length) return `已选 ${selectedIds.value.length} 份`
+  if (selectedIds.value.length > 1) {
+    return '只能保留一份合同，请移除多余合同后再保存'
+  }
+  if (hintWarn.value) return '请选择合同'
+  if (selectedIds.value.length) return '已选 1 份'
   return ''
 })
 
@@ -324,9 +331,9 @@ async function loadDetails(ids: string[]) {
   }
 }
 
-async function handleConfirmMultiple(contracts: ContractVO[]) {
-  const enriched = await Promise.all((contracts || []).map(item => enrichContractProducts(item)))
-  detailRows.value = enriched
+async function handleConfirmSingle(contract: ContractVO) {
+  const enriched = await enrichContractProducts(contract)
+  detailRows.value = [enriched]
   emitLinksFromDetails(detailRows.value)
 }
 
@@ -369,7 +376,9 @@ async function handleViewContract(contractId: string) {
 }
 
 defineExpose({
-  openSelector
+  openSelector,
+  getContractProductIds: () =>
+    collectContractProductIds(detailRows.value.flatMap(row => row.products || []))
 })
 
 watch(