fix: increase Prometheus scrape interval to 60s to prevent rate limits

feat: run Prometheus internally via Supervisor and remote write to Grafana Cloud

docs/fix: update prometheus config for production scrape and startup directory check

fix: add trailing slash to prometheus scrape path to eliminate 307 redirects

feat: setup prometheus and grafana docker services and initialize core observability metrics

feat: implemented the config that tells Prometheus to scrape (pull) metrics from your FastAPI server on port 8000 every 5 seconds