perf(views): 优化实时监测页面样式，全屏时不显示圆角

src/components/visual-2d/Visual2DPreview.vue

@@ -98,7 +98,7 @@ defineExpose({
   overflow: hidden;
   background: transparent;
   border: none;
-  border-radius: 12px;
+  border-radius: inherit;
 }
 
 .visual-2d-preview-loading {

src/views/real-time-monitor/RealTimeMonitor.vue

@@ -182,5 +182,6 @@ defineExpose({
 .real-time-fullscreen {
   position: fixed;
   inset: 0;
+  border-radius: 0;
 }
 </style>