feat: Armarium v1.1.0 — dashboard, auth, 2FA, SMTP, settings, deploy

Dashboard:
- ApexCharts bar chart (income vs fixed costs vs expenses) and donut chart
- KPI cards: income, fixed costs, savings rate with configurable goal
- Greeting with time-of-day and locale-aware date/time display

Authentication & security:
- Email-based login (no username), case-insensitive lookup
- JWT access/refresh tokens with rotation and blacklist
- TOTP 2FA with QR code, backup codes (copy + PDF export)
- 2FA recovery via email code
- Cloudflare Turnstile CAPTCHA on login and register

Email flows:
- Email verification on registration (24h token)
- Password reset flow (15min token, anti-enumeration)
- Brevo SMTP integration with HTML + plaintext email templates
- Notification emails: 2FA recovery, password changed, email changed

Settings page:
- 2FA management (enable/disable, QR, backup codes)
- Active sessions list with per-device revoke
- Data export: ZIP with 6 PDFs via fpdf2
- Notification preferences (3 toggles)
- Danger zone: account deletion with mandatory export + confirmation phrase

UI & layout:
- Sidebar with collapsible/flyout mode, Angular signal-based dropdowns
- Dark mode (class-based), language switcher (DE/FR/IT/EN)
- Mobile-responsive layout with touch-friendly targets
- Roboto font via @fontsource (GDPR-compliant, no Google CDN)
- Pure Tailwind CSS v3

Infrastructure:
- Forgejo Actions CI/CD pipeline (auto-deploy on push to main)
- Gunicorn + Nginx + PostgreSQL production setup
- Rate limiting, HSTS, secure cookies, CSRF protection

backend/templates/emails/registration_confirm.txt

@@ -0,0 +1,15 @@
+Armarium – E-Mail-Adresse bestätigen
+
+Hallo,
+
+Willkommen bei Armarium! Bitte bestätige deine E-Mail-Adresse, um dein Konto zu aktivieren.
+
+Link zur Bestätigung:
+{{ link }}
+
+Gültig für 24 Stunden.
+
+Falls du dieses Konto nicht erstellt hast, kannst du diese E-Mail ignorieren.
+
+– Das Armarium-Team
+https://www.armarium.ch