feat: flat design Sunset Glitch + download manager + settings + recommendations overhaul

- Sunset Glitch color palette applied to all templates
- Font Awesome icons throughout UI
- Download manager with parallel queue and progress tracking
- Settings page with dynamic configuration
- Recommendations router enhanced with scoring
- Local vendor libs (Alpine.js, HTMX) for offline support
- Auto test suite with screenshots
- Series releases list component
- New download model

templates/components/series_releases_list.html

@@ -0,0 +1,11 @@
+{% from "components/series_card.html" import series_card %}
+
+{% if releases %}
+    {% for series in releases %}
+        {{ series_card(series) }}
+    {% endfor %}
+{% else %}
+    <div class="empty-state">
+        <p>Aucune sortie recente trouvee.</p>
+    </div>
+{% endif %}