fix: 出库申请的出库类型改为不默认、必填校验（不能为空提交）

inventory-web/src/views/outbound/Selection.vue

@@ -542,7 +542,7 @@ const printLoading = ref(false)
 // ★ 出库申请相关
 const requestDialogVisible = ref(false)
 const requestRemark = ref('')
-const requestOutboundType = ref('SALES')  // 申请时确定出库类型，扫码出库自动带出
+const requestOutboundType = ref('')  // 申请时必选出库类型，扫码出库自动带出（不默认）
 const requestApproverId = ref<number | null>(null)
 const approvers = ref<any[]>([])
 const requestSubmitting = ref(false)
@@ -1086,6 +1086,10 @@ const confirmSubmitRequest = async () => {
     ElMessage.warning('请选择指定审批人')
     return
   }
+  if (!requestOutboundType.value) {
+    ElMessage.warning('请选择出库类型')
+    return
+  }
 
   requestSubmitting.value = true
   try {