feat: 新增选项操作功能并优化问卷设计页面

- 新增 OptionAction 组件用于选项操作
- 更新 BaseSelect 组件，集成 OptionAction 功能
- 优化 Paging 组件样式
- 调整 Design 页面布局和样式

src/views/Design/Index.vue

@@ -1,5 +1,5 @@
 <template>
-  <div>
+  <div class="design-create">
     <draggable
       v-model:data="questionInfo.questions"
       item-key="id"
@@ -115,4 +115,10 @@ onMounted(() => {
   questionInfo.value = store.questionsInfo.value;
 });
 </script>
-<style scoped lang="scss"></style>
+<style scoped lang="scss">
+.design-create {
+  min-height: calc(100vh);
+  background-color: #e9eef3;
+  color: #333;
+}
+</style>