Get all settings for the currently active group

Returns settings for the group the caller is currently working in — the same shape as GET /groups/{groupID}/settings, with the group resolved from the session instead of the URL. Without keys, every setting on the active group is returned. With keys (comma-separated, e.g. key1,key2,key3), only the matching settings are returned and their values are evicted from the group-settings cache. When keys is supplied and none match, the call returns 404.

Use this for the caller's own group. Use the by-ID variant when administering several groups.