feat(审批): 添加撤回审批功能并优化审批状态显示

- 在approval.js中添加withdrawApproval API方法
- 在leave.vue和goout.vue中启用撤回按钮并调用新API
- 在todo/index.vue中优化审批状态显示逻辑

klp-ui/src/api/wms/approval.js

@@ -42,3 +42,16 @@ export function delApproval(approvalId) {
     method: 'delete'
   })
 }
+
+/**
+ * 撤销审批
+ */
+export function withdrawApproval(approvalId) {
+  return request({
+    url: '/wms/approval/cancel',
+    method: 'post',
+    params: {
+      approvalId: approvalId
+    }
+  })
+}