fix: 首页背景更换

src/app.vue

@@ -14,7 +14,7 @@
 .main-content {
   width: 100%;
   height: 100%;
-  background: url("assets/images/background.svg") no-repeat center;
+  background: url("assets/images/background.jpg") no-repeat center;
   background-size: cover;
   overflow: hidden;
 }