Backend: Système complet RSS + OpenRouter + Administration améliorée

## Base de données:
- Table settings (key-value pour paramètres globaux)
- Table rss_feeds (url, title, description, enabled, last_fetched_at)
- Table rss_articles (feed_id, title, link, description, pub_date, content)
- Index optimisés pour performance

## Routes Settings (/api/settings):
- GET /api/settings - Récupérer tous les paramètres
- GET /api/settings/:key - Récupérer un paramètre
- PUT /api/settings/:key - Mettre à jour un paramètre
- DELETE /api/settings/:key - Supprimer un paramètre
- Middleware requireAdmin sur toutes les routes

## Routes RSS (/api/rss):
- GET /api/rss/feeds - Liste des flux RSS (admin)
- POST /api/rss/feeds - Ajouter flux RSS avec parsing validation (admin)
- PUT /api/rss/feeds/:id - Activer/désactiver flux (admin)
- DELETE /api/rss/feeds/:id - Supprimer flux (admin)
- POST /api/rss/fetch - Récupérer articles de tous flux actifs (admin)
- GET /api/rss/articles - Récupérer 10 derniers articles (tous users)
- POST /api/rss/summarize - Générer résumé OpenRouter (admin)
- GET /api/rss/models - Liste modèles OpenRouter (admin)

## Intégration OpenRouter:
- Appel API avec clé, modèle et prompt configurables
- Résumé intelligent des 10 derniers articles
- Prompt par défaut optimisé pour résumés d'actualités
- Support GPT-4, Claude 3, Gemini, Llama 3, Mistral, etc.
- Gestion erreurs et timeout

## Parser RSS:
- rss-parser installé pour parsing flux
- Gestion articles avec contenu, description, date
- Détection doublons par URL
- Update automatique infos flux

## Frontend HTML:
- Modal admin avec système à onglets (Users/RSS/OpenRouter)
- Modal changement mot de passe sans prompt navigateur
- Box RSS dans page principale affichage 10 derniers articles
- Bouton résumé IA dans header box RSS
- Inputs pour gestion flux RSS
- Configuration OpenRouter (API key, modèle, prompt, activation)
- Sélecteur modèles avec recherche

Prochaine étape: CSS + JavaScript pour fonctionnalités

package-lock.json

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