Service port mapping UI/UX improvement

[jasalt]

Current domain / port mapping interface is not the most intuitive.

Example with Otel Collector container with SigNoz service (https://coolify.io/docs/services/signoz):

Issues with example mapping rule https://signoz-http.example.com:4318,https://signoz-grpc.example.com:4317:

• requires "internal" knowledge that port after the domain name is the container port, not a port for the traffic coming to proxy
• UI can't show multiple mappings as text overflow gets hidden

Quick sketch on how the UI might work better for handling multiple container port mappings:

Possibly related:

• [Improvement]: Port mapping refactor #3161