Enhancement Service Status when Services support it

[danielithomas]

Service status checks on models and the ability to raise or log an alert when not available. Intention is to make it more visible if a service or model is not available.

Areas to check.

1. Check if APIs have a health check or heartbeat for service & models
2. Check if there is an API for a service's service status pages
3. Local - health checks: Server Running check
4. Last resorts: Service Status scraping.

Note: For Ollama, service status might need to be added (see ollama/ollama#15419) though also check if there is an API option.