Release v2.1.48

Changelog:
- refine the administration page so the selected tab owns the header and primary action without duplicated inner page chrome
- expand audit log filters to cover the full emitted action/resource set and add a details modal for individual entries
- include explicit target user details in admin user-management audit entries such as group changes, block/unblock, create, and delete
- fix the database monitoring stream race so the first live snapshot is not missed on initial connect