Approve an add-subdomain replacement plan

Requires the workflows:add-subdomain entitlement for the execution and mutates a paused workflow by resuming its approval hook. The execution must be waiting for replacement approval of the submitted current plan hash; an already accepted approval is replayed safely.

curl -X POST "https://example.com/v1/executions/string/subdomain-plan/approve" \  -H "Content-Type: application/json" \  -d '{    "planHash": "string"  }'

{  "accepted": true,  "planHash": "string",  "replayed": true}