fix: 添加空状态提示，方便调试

src/pages/category/index.vue

@@ -60,6 +60,7 @@
           <text class="dialog-title">{{ currentCategory.name }} - 属性配置</text>
         </view>
         <view class="dialog-body">
+          <view v-if="attributes.length === 0" class="empty-tip">暂无属性，点击下方按钮添加</view>
           <view v-for="(attr, index) in attributes" :key="index" class="attr-item">
             <input class="input attr-name" v-model="attr.name" placeholder="属性名称" />
             <select class="input attr-type" v-model="attr.attrType">
@@ -465,6 +466,13 @@ export default {
   border-radius: 8rpx;
 }
 
+.empty-tip {
+  text-align: center;
+  color: #999;
+  padding: 40rpx 0;
+  font-size: 28rpx;
+}
+
 .add-attr-btn {
   padding: 20rpx;
   text-align: center;