fix(system): 修正直播配置页面字段标签显示

- 将直播图字段标签修改为展示图以更准确描述功能
- 统一表格和表单中对应字段的标签命名
- 保持界面一致性和用户体验的准确性

src/views/system/physical/officialLiveConfig/index.vue

@@ -49,7 +49,7 @@
         <el-table-column type="selection" width="55" align="center" />
         <el-table-column label="编号" align="center" prop="id" v-if="true" />
         <el-table-column label="直播名称" align="center" prop="liveName" />
-        <el-table-column label="直播图" align="center" width="90">
+        <el-table-column label="展示图" align="center" width="90">
           <template #default="scope">
             <el-image
               v-if="scope.row.imageUrl"
@@ -134,7 +134,7 @@
         <el-form-item label="直播流地址" prop="liveSource">
           <el-input v-model="form.liveSource" type="textarea" placeholder="请输入内容" />
         </el-form-item>
-        <el-form-item label="直播图片" prop="imageUrl">
+        <el-form-item label="展示图" prop="imageUrl">
           <div class="upload-container">
             <el-upload
               class="upload-icon"