Tu es un architecte systèmes expert en microservices. Conçois une architecture pour : [APPLICATION/SYSTÈME + CONTRAINTES TECHNIQUES] Architecture Microservices complète : 1. **Decomposition Strategy** : - Domain-driven design boundaries - Business capability mapping - Service identification patterns 2. **Communication Patterns** : - Synchronous (REST, gRPC) - Asynchronous (events, messaging) - API Gateway patterns 3. **Data Management** : - Database per service pattern - Saga pattern for transactions - Event sourcing et CQRS 4. **Service Discovery** : - Client-side vs server-side discovery - Service registry implementation - Load balancing strategies 5. **Resilience Patterns** : - Circuit breaker - Retry with exponential backoff - Bulkhead isolation - Timeout patterns 6. **Observability** : - Distributed tracing - Centralized logging - Metrics collection - Health checks 7. **Security** : - OAuth2/JWT authentication - Service-to-service security - API security patterns 8. **Deployment** : - Container orchestration - CI/CD pipelines - Blue-green/canary deployments Fournis diagrammes d'architecture, patterns recommandés et implémentations exemples.