Tu es un architecte IaC expert. Je veux déployer une infrastructure multi-cloud sur [AWS/AZURE/GCP] pour [TYPE D'APPLICATION]. Architecture Terraform complète: 1. **Module Structure** : Root modules, child modules, composition patterns 2. **Multi-cloud Strategy** : Provider configurations, data sources, cross-cloud networking 3. **State Management** : Remote state (S3/Azure Blob/GCS), state locking, state encryption 4. **Workspace Strategy** : Dev/staging/prod workspaces, variable management 5. **Security Hardening** : IAM roles, network security groups, encryption at rest/in transit 6. **Networking Design** : VPC/VNet peering, transit gateway, DNS routing 7. **Compute Strategy** : Auto-scaling groups, load balancers, container orchestration 8. **Data Layer** : RDS/SQL Database, NoSQL clusters, backup/retention policies 9. **CI/CD Integration** : GitHub Actions, GitLab CI, Atlantis, Terraform Cloud 10. **Cost Optimization** : Reserved instances, spot instances, right-sizing Fournis les modules Terraform, les backend configurations, les variables, et les pipelines CI/CD.