fix: 布局对齐 + 侧边栏圆角UI

- el-container: width:100% 确保全宽
- el-aside: 圆角16px + 阴影 + margin间距 + 去掉 border-right
- menu-top: margin-top 86px → 12px (logo已移到顶栏)
- 顶栏全宽对齐

clientarea/hgcloud/css/dark-override.css

@@ -25,13 +25,28 @@ html, body {
   display: none;
 }
 
+/* ============ 布局容器 ============ */
+.el-container {
+  width: 100% !important;
+}
+
 /* ============ 侧边栏 ============ */
 .el-aside {
   background: #FFFFFF !important;
-  border-right: 1px solid rgba(0,0,0,0.06);
+  border-right: none !important;
   height: calc(100vh - 60px) !important;
   position: sticky !important;
   top: 60px !important;
+  margin: 12px 0 12px 12px !important;
+  border-radius: 16px !important;
+  box-shadow: 0 1px 3px rgba(0,0,0,0.04) !important;
+  overflow: hidden !important;
+  z-index: 10 !important;
+}
+
+/* 去掉侧边栏旧的 margin-top（logo 已移到顶栏） */
+.menu-top {
+  margin-top: 12px !important;
 }
 
 .ali-logo {