feat(pl): 增加百链充值类型，并保留计划产品与证件上传时间。

充值单号按类型使用 ETC、YK、SX、BL 前缀；更换装货客户清空产品时不抹掉已有计划产品；运输证件列表展示上传时间。

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

web-admin/scripts/pl-child-identity.test.ts

@@ -6,7 +6,9 @@ import {
   buildStopProductPayload,
   syncDeliveriesProductsFromLoad,
   createEmptyDeliveryForm,
-  mergePlanProductsFromLoadMirror
+  mergePlanProductsFromLoadMirror,
+  mapLoadProductsToPlanFormRows,
+  shouldRetainPlanProductsWhileLoadEmpty
 } from '../src/utils/pl-plan-stop-form'
 
 const product = {
@@ -35,6 +37,34 @@ test('refreshing delivery products retains that delivery identity', () => {
   assert.equal(result.deliveries[0].products[0].id, 'delivery-product')
 })
 
+test('clearing load products keeps the plan product until the same product is selected again', () => {
+  const previous = [
+    {
+      id: 'pp',
+      productId: 'sku',
+      packageSpec: '槽罐车',
+      quantity: 33,
+      deliveryMethod: '一票制送到',
+      productName: '32%液碱'
+    }
+  ]
+  assert.equal(shouldRetainPlanProductsWhileLoadEmpty([], previous), true)
+  assert.equal(shouldRetainPlanProductsWhileLoadEmpty([], []), false)
+  const reselected = mapLoadProductsToPlanFormRows([
+    {
+      productId: 'sku',
+      productName: '32%液碱',
+      packageSpec: '槽罐车',
+      planQty: 33,
+      deliveryMethod: '自提'
+    }
+  ])
+  const merged = mergePlanProductsFromLoadMirror(reselected, previous)
+  assert.equal(merged[0].id, 'pp')
+  assert.equal(merged[0].deliveryMethod, '自提')
+  assert.equal(merged.length, 1)
+})
+
 test('desktop mirror consumes previous product identities once for repeated SKUs', () => {
   const before = [
     { ...product, id: 'first', quantity: 1 },