Integrations could only find a client by subscription ID through a substring
search over the paged client list followed by a second lookup by email.
GET /panel/api/clients/get/subId/:subId now returns the full client records
(settings, attached inbounds, external links, traffic, tunnel addresses) for an
exact subId match, as a list because older rows may share an ID. It sits behind
the same admin login or admin-token check as the email lookup.
CHANGAO MA