style(layout): 更新侧边栏Logo样式

- 将Logo高度从h-8调整为h-12
- 将Logo宽度从w-24调整为w-40
- 移除原有的文字标题"知识应用管理系统"

frontend/src/pages/Layout/Sidebar.tsx

@@ -74,8 +74,7 @@ const AsiderAndHeaderLayout = () => {
       <div className="flex items-center justify-between p-4 border-b border-gray-200">
         {sidebarOpen && (
           <NavLink to="/" className="flex items-center gap-2 cursor-pointer">
-            <img src="/assets/logo.png" alt="logo" className="h-8 w-24" />
-            <span className="text-lg font-bold text-gray-900">知识应用<br/>管理系统</span>
+            <img src="/assets/logo.png" alt="logo" className="h-12 w-40" />
           </NavLink>
         )}
         <span