refactor: clean up login-kicker and update button text

remove the unused .login-kicker CSS class and corresponding span element from the login page
update the login button text to "login" from the original "enter maintenance desk" for more accurate labeling

src/pages/login/LoginPage.tsx

@@ -31,7 +31,6 @@ export function LoginPage({ onDone }: { onDone: () => void }) {
     <main className="login-shell">
       <Card className="login-panel">
         <CardHeader className="p-0">
-          <span className="login-kicker">万趣运营后台</span>
           <CardTitle>万趣小程序管理端</CardTitle>
           <CardDescription>按前台页面结构维护内容、商品和线索。</CardDescription>
         </CardHeader>
@@ -50,7 +49,7 @@ export function LoginPage({ onDone }: { onDone: () => void }) {
                 <AlertDescription>{error}</AlertDescription>
               </Alert>
             ) : null}
-            <Button disabled={loading}>{loading ? "登录中" : "进入维护台"}</Button>
+            <Button disabled={loading}>{loading ? "登录中" : "登录"}</Button>
           </form>
         </CardContent>
       </Card>