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

vitest.setup.ts

@@ -0,0 +1,18 @@
+import '@testing-library/jest-dom';
+import { cleanup } from '@testing-library/react';
+import { afterEach, vi } from 'vitest';
+
+vi.mock('next-intl', () => ({
+  useTranslations: () => (key: string) => key,
+  useLocale: () => 'en',
+}));
+
+vi.mock('next/navigation', () => ({
+  useRouter: () => ({ push: vi.fn(), back: vi.fn() }),
+  useParams: () => ({ locale: 'en' }),
+  usePathname: () => '/en',
+}));
+
+afterEach(() => {
+  cleanup();
+});