refactor(guest): retire legacy guest app and move shared modules

resources/js/guest-v2/__tests__/HelpCenterScreen.test.tsx

@@ -35,19 +35,19 @@ vi.mock('../components/SurfaceCard', () => ({
   default: ({ children }: { children: React.ReactNode }) => <div>{children}</div>,
 }));
 
-vi.mock('@/guest/components/PullToRefresh', () => ({
+vi.mock('@/shared/guest/components/PullToRefresh', () => ({
   default: ({ children }: { children: React.ReactNode }) => <div>{children}</div>,
 }));
 
-vi.mock('@/guest/i18n/useTranslation', () => ({
+vi.mock('@/shared/guest/i18n/useTranslation', () => ({
   useTranslation: () => ({ t: (_key: string, fallback?: string) => fallback ?? _key, locale: 'de' }),
 }));
 
-vi.mock('@/guest/i18n/LocaleContext', () => ({
+vi.mock('@/shared/guest/i18n/LocaleContext', () => ({
   useLocale: () => ({ locale: 'de' }),
 }));
 
-vi.mock('@/guest/services/helpApi', () => ({
+vi.mock('@/shared/guest/services/helpApi', () => ({
   getHelpArticles: () => Promise.resolve({
     servedFromCache: false,
     articles: [{ slug: 'intro', title: 'Intro', summary: 'Summary', updated_at: null }],