style(article-management): 优化附件列表样式

- 在 add.vue 和 detail.vue 中为附件列表项添加底部间距，提升可读性
- 保持附件列表样式在不同页面中的一致性

src/views/article-management/add.vue

@@ -52,7 +52,7 @@
 <!--            </template>-->
             <el-col :span="24" style="margin-left: -15px">
               <div style="display: flex;flex-direction: column">
-                <div v-for="(item,index) in formData.fileList" style="display: flex;align-items: center">
+                <div v-for="(item,index) in formData.fileList" style="display: flex;align-items: center;margin-bottom: 5px">
                   附件{{ index + 1 }}：  <a :href="item.url" style="color: #409eff;" class="a-style" target="_blank">{{ item.originalFileName }}</a>
                   <el-icon size="18" style="margin:0 20px;cursor: pointer" color="#409eff" @click="handleDelete(item,index)">
                     <CircleClose/>

src/views/article-management/detail.vue

@@ -10,7 +10,7 @@
       <el-row gutter="20">
         <el-col :span="24">
           <div style="display: flex;flex-direction: column">
-            <div v-for="(item,index) in formData.fileList" style="display: flex;align-items: center">
+            <div v-for="(item,index) in formData.fileList" style="display: flex;align-items: center;margin-bottom: 5px">
               附件{{ index + 1 }}： <a :href="item.url" style="color: #409eff;" class="a-style" target="_blank">{{ item.originalFileName }}</a>
               <el-button type="primary" link @click="handleDownload(item)" style="font-size: 16px;margin-left: 10px">下载</el-button>
             </div>