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Add email as a second notification channel alongside ntfy: - Tabbed channel selector: ntfy | Email | Telegram (coming soon) | Discord (coming soon) - Active channel shown with green status dot on tab - Email tab: address input, Save & Enable, Test, Disable — same UX pattern as ntfy - Backend: SMTP config in settings (SMTP_HOST/PORT/USER/PASSWORD/FROM/STARTTLS) - Dispatcher: _send_email() helper wired into dispatch_notifications - POST /api/notifications/test/email endpoint with descriptive error messages - Email fires in same window as ntfy (respects quiet hours / digest hold) - Telegram and Discord tabs show coming-soon banners with planned feature description - .env.example documents all SMTP settings with provider examples Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>