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/password_changed.html

@@ -0,0 +1,24 @@
+{% extends "emails/base.html" %}
+
+{% block subject %}Armarium – Dein Passwort wurde geändert{% endblock %}
+
+{% block body %}
+  <p style="margin:0 0 20px;font-size:15px;color:#374151;line-height:1.6;">Hallo,</p>
+
+  <p style="margin:0 0 20px;font-size:15px;color:#374151;line-height:1.6;">
+    Dein Armarium-Passwort wurde erfolgreich geändert.
+  </p>
+
+  <table role="presentation" width="100%" cellpadding="0" cellspacing="0" style="margin:0 0 24px;">
+    <tr>
+      <td style="background-color:#f5f3ff;border-left:3px solid #7c3aed;border-radius:0 6px 6px 0;padding:14px 18px;">
+        <p style="margin:0;font-size:13px;color:#374151;line-height:1.6;">
+          Falls du diese Änderung nicht selbst vorgenommen hast, kontaktiere uns umgehend unter
+          <a href="mailto:support@armarium.ch" style="color:#7c3aed;text-decoration:none;">support@armarium.ch</a>.
+        </p>
+      </td>
+    </tr>
+  </table>
+
+  <p style="margin:0;font-size:15px;color:#374151;line-height:1.6;">– Das Armarium-Team</p>
+{% endblock %}