优化：修复侧栏滚动与权限管理位置

src/app/(main)/layout.tsx

@@ -91,6 +91,7 @@ const NAV_GROUPS: NavGroup[] = [
       { key: '/users', icon: <UserOutlined />, label: '用户管理' },
     ],
   },
+  { key: '/admins', icon: <TeamOutlined />, label: '权限管理' },
   {
     key: 'monitoring-audit',
     icon: <FileSearchOutlined />,
@@ -103,7 +104,6 @@ const NAV_GROUPS: NavGroup[] = [
       { key: '/audit-logs', icon: <FileSearchOutlined />, label: '审计日志' },
     ],
   },
-  { key: '/admins', icon: <TeamOutlined />, label: '权限管理' },
 ];
 
 // 导航项 key(/dashboard)→ 权限页 key(dashboard),与后端 permissions.py 目录对齐
@@ -223,8 +223,7 @@ export default function MainLayout({ children }: { children: React.ReactNode })
           position: 'sticky',
           top: 0,
           height: '100vh',
-          overflowY: 'auto',
-          overflowX: 'hidden',
+          overflow: 'hidden',
         }}
       >
         <nav className={`side-nav${collapsed ? ' side-nav-collapsed' : ''}`} aria-label="后台导航">
@@ -314,8 +313,19 @@ export default function MainLayout({ children }: { children: React.ReactNode })
         .side-nav {
           display: flex;
           flex-direction: column;
+          box-sizing: border-box;
           gap: 4px;
-          padding: 0 10px 14px;
+          height: calc(100vh - 48px);
+          min-height: 0;
+          overflow-x: hidden;
+          overflow-y: auto;
+          overscroll-behavior: contain;
+          padding: 0 10px 20px;
+          scrollbar-gutter: stable;
+          -webkit-overflow-scrolling: touch;
+        }
+        .side-nav:focus-within {
+          scroll-behavior: smooth;
         }
         .nav-group {
           padding: 6px 0 8px;