fix(eam): read the instance name from SRM's ref

SRM keeps the name an App Provider asks for as the service instance's
ref, and its instance listing has no "name" field. SRMServiceInstance
read "name", always got None, and the CAMARA AppInstanceInfo fell back
to the instance id, for local and partner-hosted instances alike. The
unit fakes built instances with name=, so no test saw it.

Accept ref, keeping name as an alias so the fakes still work, and add a
test that parses SRM's real response shape.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>