```

feat(workflowTrade): 修改工作流交易页面需求显示字段

- 将原本显示requirements字段改为显示background字段
- 添加line3样式类以支持多行文本显示
```

src/pages/workflowTrade/workflowTrade.vue

@@ -103,7 +103,7 @@
                 <span class="font_size14">{{$t('common.signUpDeadline')}}：{{item.deadline}}</span>
               </div>
             </div>
-            <div class="font_size16 gray mt10">{{item.requirements || ''}}</div>
+            <div class="font_size16 gray mt10 line3">{{item.background || ''}}</div>
           </div>
           <div class="mt20">
             <div class="flex-between">