feat: 初始化音乐项目后台管理系统- 新增后台管理相关页面和功能组件

- 实现管理员评论管理、数据统计等功能
- 添加后台布局和路由管理
-配置数据库和Redis连接
- 实现文件上传和访问路径配置
- 添加Sa-Token安全配置

music-qianduan/src/assets/css/global.css

@@ -0,0 +1,76 @@
+/* 全局样式 */
+
+/* 确保所有菜单项显示在同一层级 */
+.el-menu--horizontal {
+  display: flex !important;
+  flex-wrap: nowrap !important;
+  overflow: visible !important;
+  border-bottom: none !important;
+  background-color: transparent !important;
+}
+
+.el-menu--horizontal > .el-menu-item {
+  display: block !important;
+  visibility: visible !important;
+  opacity: 1 !important;
+  pointer-events: auto !important;
+  flex-shrink: 0 !important;
+  border-bottom: none !important;
+  height: 70px !important;
+  line-height: 70px !important;
+}
+
+/* 菜单项样式 */
+.el-menu-demo.main-nav {
+  border-bottom: none !important;
+  background-color: transparent !important;
+  height: 70px !important;
+}
+
+/* 确保所有菜单项都显示 */
+.el-menu-item[index="/"],
+.el-menu-item[index="/music"],
+.el-menu-item[index="/playlist"],
+.el-menu-item[index="/singer"] {
+  display: block !important;
+  visibility: visible !important;
+  opacity: 1 !important;
+  height: 70px !important;
+  line-height: 70px !important;
+  font-size: 16px !important;
+  font-weight: 500 !important;
+  padding: 0 20px !important;
+  min-width: 80px !important;
+}
+
+/* 移除更多菜单按钮，但保留菜单项 */
+.el-menu--horizontal .el-sub-menu__icon-more,
+.el-menu--horizontal .el-icon--more {
+  display: none !important;
+  visibility: hidden !important;
+  opacity: 0 !important;
+  pointer-events: none !important;
+}
+
+/* 防止双滚动条 */
+html, body {
+  overflow: hidden; /* 禁止整个页面滚动 */
+}
+
+/* 确保内容区域只有一个滚动条 */
+.el-main {
+  overflow-y: hidden !important;
+  overflow-x: hidden !important;
+}
+
+/* 确保所有页面内容区域适应高度 */
+.home-container,
+.music-page,
+.playlist-container,
+.singer-container,
+.search-container,
+.user-container,
+.singer-detail-container,
+.playlist-detail-container {
+  height: 100%;
+}