feat: Complete Sonarr integration with security enhancements

This commit adds comprehensive Sonarr webhook integration and implements
critical security improvements identified in code review.

## Sonarr Integration
- Full webhook support for Grab, Download, Rename, Delete, and Test events
- HMAC SHA256 signature verification for webhook authentication
- Series mapping system (Sonarr TVDB ID → Anime Provider URL)
- 11 new API endpoints for configuration, mappings, search, and downloads
- Comprehensive test suite (31 tests, all passing)
- Complete documentation in docs/SONARR_INTEGRATION.md

## Security Enhancements
- CORS restricted to specific origins (user's IP: 192.168.1.204:3000)
- Path traversal prevention via sanitize_filename() and is_safe_filename()
- Structured logging infrastructure (replaced all print() statements)
- Environment-based configuration with .env support
- Filename sanitization prevents malicious path attacks

## New Features
- Lpayer and Sibnet downloader support
- Kitsu API integration for anime metadata
- Recommendation engine based on download history
- Latest releases endpoint for new anime
- Modular web interface with component-based templates

## Configuration
- Centralized settings via app/config.py with pydantic-settings
- Sonarr config auto-created in config/ directory
- Example configurations provided for easy setup

## Tests
- 31 Sonarr integration tests (23 functionality + 9 security)
- 100+ tests passing in core test files
- Security utilities fully tested

## Documentation
- Updated CLAUDE.md with Sonarr and testing info
- Added IMPROVEMENTS_2024-01-24.md analysis
- Added SONARR_IMPLEMENTATION.md technical summary

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

README.md

@@ -302,20 +302,33 @@ class MyAnimeDownloader(BaseDownloader):
 - `GET /api/anime/metadata?enrich=true` - Métadonnées enrichies
 - `GET /api/recommendations` - Suggestions personnalisées
 
-### Version 2.5 - Webhooks & Automatisation
-- [ ] **Support Sonarr Webhook** :
-  - [ ] `POST /api/webhook/sonarr` - Réception événements
-  - [ ] Auto-téléchargement des nouveaux épisodes
-  - [ ] Vérification HMAC SHA256 (optionnel)
-  - [ ] Gestion des événements : Download, Rename, Delete
-- [ ] **Automatisations** :
-  - [ ] Déclenchement automatique sur nouvel épisode
-  - [ ] Analyse des infos épisodes depuis Sonarr
-  - [ ] Mapping automatique vers les providers
+### Version 2.5 - Webhooks & Automatisation ✅ (Terminé)
+- [x] **Support Sonarr Webhook** :
+  - [x] `POST /api/webhook/sonarr` - Réception événements
+  - [x] Auto-téléchargement des nouveaux épisodes
+  - [x] Vérification HMAC SHA256 (optionnel)
+  - [x] Gestion des événements : Download, Rename, Delete
+- [x] **Automatisations** :
+  - [x] Déclenchement automatique sur nouvel épisode
+  - [x] Analyse des infos épisodes depuis Sonarr
+  - [x] Mapping automatique vers les providers
+  - [x] Système de mapping series Sonarr → anime providers
+  - [x] Configuration API pour webhooks et mappings
 
 **Nouveaux endpoints :**
-- `POST /api/webhook/sonarr` - Webhook principal
+- `POST /api/webhook/sonarr` - Webhook principal Sonarr
 - `POST /api/webhook/test/sonarr` - Test de payload
+- `GET /api/sonarr/config` - Configuration webhook
+- `PUT /api/sonarr/config` - Mise à jour configuration
+- `GET /api/sonarr/mappings` - Liste des mappings
+- `POST /api/sonarr/mappings` - Créer mapping
+- `DELETE /api/sonarr/mappings/{id}` - Supprimer mapping
+- `GET /api/sonarr/search` - Rechercher anime
+- `GET /api/sonarr/episodes` - Liste épisodes
+- `GET /api/sonarr/suggest` - Suggestions mappings
+- `POST /api/sonarr/download` - Déclencher téléchargement manuel
+
+**Documentation :** Voir [docs/SONARR_INTEGRATION.md](docs/SONARR_INTEGRATION.md)
 
 ### Version 2.6 - Gestion de Bibliothèque Avancée
 - [ ] **Bibliothèque personnelle** : Gérer sa collection d'anime téléchargés