fix: 统计显示问题

src/views/statistics/index.vue

@@ -193,7 +193,7 @@
                 </div>
                 <div class="card-row">
                   <span>视频完播率</span>
-                  <span class="highlight">{{watchRate}}</span>
+                  <span class="highlight">{{watchRate}}%</span>
                 </div>
               </div>
             </div>