style(SeizedItems): 为图例添加滚动类型优化展示

为 seized items 组件的ECharts图例新增滚动配置，避免图例过多时超出容器导致显示异常

src/views/portraitManagement/components/SeizedItems.vue

@@ -31,6 +31,7 @@ const setChartsOptionsBar = computed(() => {
       textStyle: { color: '#fff' }
     },
     legend: {
+      type: 'scroll',
       top: 'center',
       left: '0%',
       orient: 'vertical',