RustDesk 1.4.x filters Available Devices locally by exact
device_group_name match; only folder names were set before, so manual
panel groups appeared in the sidebar but showed zero peers. Also align
the TOTP login challenge with RustDesk 1.4.7 (email_check/tfa_check).
Panel groups and folders live in console auth.db, but Go /api/group only
exposed peer tags. Read auth.db (AUTH_DB_PATH), apply allowed_users and
user-group access, and mirror Node getRustDeskDeviceGroups. Keep /api/group
on the Node :21121 proxy for compatibility; document verification steps.