Implement Performance Features and Monitoring

[davideme]

Add performance features and monitoring capabilities to the TypeScript implementation.

Tasks:

• Implement caching:
  • Response caching
  • In-memory caching for frequently accessed data
  • Cache headers
• Add rate limiting:
  • Global rate limits
  • Per-endpoint limits
  • User-based limits
• Set up performance monitoring:
  • Response time tracking
  • Resource usage monitoring
  • Prometheus metrics
  • Custom dashboards
• Add performance tests:
  • Load tests
  • Stress tests
  • Benchmark critical paths
• Document performance expectations and SLAs

Related to main TypeScript implementation issue.