refactor: remove duplicate shutdown button from settings

Keep only one shutdown button in header, remove duplicate from settings page

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/src/setting/index.ts

@@ -34,15 +34,6 @@ export class SettingRoute implements VanComponent {
                     () => _that.loading.val ? '' : div({ class: 'vstack gap-4' },
                         SaveFolderSetting(_that),
                         div({ class: 'hstack gap-3' },
-                            button({
-                                class: 'btn btn-outline-secondary', onclick() {
-                                    if (!confirm('确定要关闭软件吗?')) return
-                                    fetch('/api/quit').then(res => res.json()).then(res => {
-                                        if (!res.success) alert(res.message)
-                                        else document.write(`<h2 style="text-align: center; padding: 30px 20px;">软件已关闭</h2>`)
-                                    })
-                                }
-                            }, '关闭软件'),
                             button({
                                 class: 'btn btn-outline-danger', onclick() {
                                     if (!confirm('确定要退出登录吗?')) return