登录固定 WebOnly，并增强部署向导流程。

移除启动模式切换与 ScopeSwitcher；向导拆分子组件并补充 setup 工具。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontends/apps/simple-platform-vue/components.d.ts

@@ -80,7 +80,6 @@ declare module 'vue' {
     ReflectionManagerPanel: typeof import('./src/components/reflection/ReflectionManagerPanel.vue')['default']
     RouterLink: typeof import('vue-router')['RouterLink']
     RouterView: typeof import('vue-router')['RouterView']
-    ScopeSwitcher: typeof import('./src/components/ScopeSwitcher.vue')['default']
     SelectionDetailPanel: typeof import('./src/components/workbench/SelectionDetailPanel.vue')['default']
     SitePickDialog: typeof import('./src/components/workbench/SitePickDialog.vue')['default']
     ThemeCustomizer: typeof import('./src/components/ThemeCustomizer.vue')['default']