feat: 新增顶部布局模式

src/layouts/components/NavigationBar/index.vue

@@ -95,6 +95,8 @@ const logout = () => {
   }
   .sidebar {
     flex: 1;
+    // 设置 min-width 是为了让 Sidebar 里的 el-menu 宽度自适应
+    min-width: 0px;
     :deep(.el-menu) {
       background-color: transparent;
     }

src/layouts/components/Settings/SelectLayoutMode.vue

@@ -23,7 +23,7 @@ const isLeftTop = computed(() => layoutMode.value === "left-top")
         </el-container>
       </el-container>
     </el-tooltip>
-    <el-tooltip content="顶部模式（开发中）">
+    <el-tooltip content="顶部模式">
       <el-container class="layout-mode top" :class="{ active: isTop }" @click="layoutMode = 'top'">
         <el-header />
         <el-main />