feat(order): 添加发货单号字段支持

- 在发货对话框中新增发货单号输入框
- 为发货表单数据结构添加 flexid 字段
- 在发货接口调用中传递发货单号参数
- 初始化发货单号字段为空字符串
- 修复发货表单数据初始化逻辑

src/views/modules/order/poOrder.vue

@@ -349,6 +349,14 @@
                 class="ship-dialog-input" />
             </el-form-item>
           </el-col>
+          <el-col :span="12" >
+            <el-form-item label="发货单号">
+              <el-input
+                v-model="shipDialogForm.flexid"
+                placeholder="选填"
+                class="ship-dialog-input" />
+            </el-form-item>
+          </el-col>
         </el-row>
       </el-form>
       <div slot="footer" class="dialog-footer ship-dialog-footer">
@@ -911,7 +919,8 @@ export default {
         inspectApproveQty: 0,
         currentShipQty: 0,
         canShipQty: 0,
-        shipQty: 0
+        shipQty: 0,
+        flexid: ''
       },
 
       // ===== 主表编辑与列渲染状态 =====
@@ -2606,7 +2615,8 @@ export default {
         inspectApproveQty: 0,
         currentShipQty: 0,
         canShipQty: 0,
-        shipQty: 0
+        shipQty: 0,
+        flexid: ''
       }
     },
 
@@ -2706,7 +2716,8 @@ export default {
         orderNo: this.shipDialogForm.orderNo,
         itemNo: this.shipDialogForm.itemNo,
         orderQty,
-        shipQty
+        shipQty,
+        flexid: (this.shipDialogForm.flexid || '').trim()
       }
       this.shipDialogSaving = true
       shipPoDetail(payload).then(({ data }) => {