[gmolto]

Summary

• Read the exposed-service routing flag from the cluster's nested /system/config response.
• Send HTTP acceptance requests to the service subdomain when subdomain routing is enabled, while retaining the legacy path for other clusters.
• Make --print-acceptance-commands generate the same route used by the validator.
• Add tests for routing, authentication, URL generation, and cluster configuration responses.

Verification

• go test ./... and go vet ./... passed.
• Local cluster: hub validate posenet-tf passed (HTTP 200, valid ZIP).
• oscar.test.fedcloud.eu-grycap: the generated URL uses the correct service subdomain, but validation currently returns HTTP 503 because the deployment remains pending. The user quota was raised from 4 to 8 GiB; deleting and redeploying the service did not resolve the issue. This must be tested again before accepting the PR.

Related

• Remote deployment and acceptance verification: grycap/issue-tracker#310.