Audit › Control plane: show session-analytics config

Found during Task 7203's visual check of Audit › Sessions › Efficiency (local stack, analytics unconfigured). 1. Efficiency's unconfigured line now sends an operator to Audit › Control plane, but that tab lists task-definition revisions only; it should also show which of the five session-analytics settings (AWS_REGION, SESSION_ANALYTICS_WORKGROUP/DATABASE/TABLE/OUTPUT) are set or empty, names only, never values. 2. The same row could state whether AWS credentials resolve for analytics, so "No AWS credentials for analytics" has a visible counterpart there. Out of scope: making analytics editable from the console; the Efficiency tab itself. Done means: - A web test and an API test cover the new state. - A desktop screenshot on the live stack shows it with analytics unconfigured. - `./dc check full` green.

Audit › Control plane shows the 5 session-analytics settings (set/empty, names only) + AWS credentials found/none. API+web tests, desktop visual check done (renders clean). Lane full gate green, merged 5a9018a; deploy superseded. Draft #7232 filed.