feat(auth): Get attached OAuth Clients endpoint
commit 4ab7daf97b322273642770c6840522dfa1f6535d Author: Nicholas ShirleyDate: Tue Nov 4 09:14:23 2025 -0700 feat(auth): Get attached OAuth Clients endpoint Because: - There is an attached clients enpoint used by firefox today, and it provides more data than Firefox needs This commit: - Introduces a new, light weight endpoint that will only fetch sessions for OAuth clients and return one record per client_id Closes: FXA-12352