feat: add contacts phase 2, advanced search, vacation responder, Docker & TOTP 2FA

- Contact groups/lists, vCard import/export (RFC 6350), bulk operations
- Advanced search with JMAP filter panel, search chips, cross-mailbox queries
- Vacation responder with JMAP VacationResponse, settings tab, sidebar indicator
- TOTP two-factor authentication support
- Docker multi-stage build with standalone output and docker-compose
- CSP Report-Only headers and security headers via proxy middleware
- Virtual scrolling for large email lists
- Structured server-side logger (text/JSON, configurable level)
- 450+ tests (contacts, vCard, threads, headers, identity, components)
- Playwright E2E framework setup
- Updated README and ROADMAP with all new features

app/[locale]/settings/page.tsx

@@ -9,21 +9,27 @@ import { AppearanceSettings } from '@/components/settings/appearance-settings';
 import { EmailSettings } from '@/components/settings/email-settings';
 import { AccountSettings } from '@/components/settings/account-settings';
 import { IdentitySettings } from '@/components/settings/identity-settings';
+import { VacationSettings } from '@/components/settings/vacation-settings';
 import { AdvancedSettings } from '@/components/settings/advanced-settings';
+import { useAuthStore } from '@/stores/auth-store';
 import { cn } from '@/lib/utils';
 
-type Tab = 'appearance' | 'email' | 'account' | 'identities' | 'advanced';
+type Tab = 'appearance' | 'email' | 'account' | 'identities' | 'vacation' | 'advanced';
 
 export default function SettingsPage() {
   const router = useRouter();
   const t = useTranslations('settings');
+  const { client } = useAuthStore();
   const [activeTab, setActiveTab] = useState<Tab>('appearance');
 
+  const supportsVacation = client?.supportsVacationResponse() ?? false;
+
   const tabs: { id: Tab; label: string }[] = [
     { id: 'appearance', label: t('tabs.appearance') },
     { id: 'email', label: t('tabs.email') },
     { id: 'account', label: t('tabs.account') },
     { id: 'identities', label: t('tabs.identities') },
+    ...(supportsVacation ? [{ id: 'vacation' as Tab, label: t('tabs.vacation') }] : []),
     { id: 'advanced', label: t('tabs.advanced') },
   ];
 
@@ -82,6 +88,7 @@ export default function SettingsPage() {
             {activeTab === 'email' && <EmailSettings />}
             {activeTab === 'account' && <AccountSettings />}
             {activeTab === 'identities' && <IdentitySettings />}
+            {activeTab === 'vacation' && <VacationSettings />}
             {activeTab === 'advanced' && <AdvancedSettings />}
           </div>
         </div>