Add monitoring and infrastructure strategy documentation

Author: codicecustode

docs/monitoring.md

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+## Monitoring and Infrastructure Strategy
+
+### Logging
+
+- Application logs are collected via `docker logs`
+- Nginx access logs help identify traffic patterns
+- Azure Monitor / ELK stack can be integrated for centralized logging
+
+### Downtime Handling
+
+- Docker container restart policies improve resilience
+- Healthcheck endpoint ensures service availability
+- Load balancer can be added for redundancy
+
+### Scaling Strategy
+
+- Horizontal scaling using multiple containers
+- VM Scale Sets or Kubernetes for auto-scaling
+- Stateless architecture to allow scaling
+
+### API Credit Monitoring
+
+- Middleware can track API usage
+- Threshold alerts can notify via email or Slack
+
+### Cost Optimization
+
+- Use smaller VM size for staging
+- Schedule non-production shutdown during low usage
+- Use autoscaling to match demand
+
+### Secrets Management
+
+- GitHub Secrets
+- Azure Key Vault
+- Avoid storing secrets in codebase