feat: Add prometheus and grafana support

[whiterabbit1983]

[!IMPORTANT] Add Prometheus and Grafana support with FastAPI metrics and Docker Compose configurations.

• Metrics Integration:
  • Add prometheus-fastapi-instrumentator to web.py for FastAPI metrics.
  • Update pyproject.toml to include prometheus-fastapi-instrumentator dependency.
• Docker Compose:
  • Add prometheus/docker-compose.yml for Prometheus configuration.
  • Add grafana/docker-compose.yml for Grafana configuration.
  • Update root docker-compose.yml to include Prometheus and Grafana services.
• Traefik Configuration:
  • Update traefik.yml.template to route /grafana to Grafana service.

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