Fix station deployment pulls after CLI deploy

Stations that had also been used for tofupilot deploy could fail to pull deployments with a "Station authentication required" error, even right after logging in. Reinstalling didn't help.

• Fixed tofupilot pull so it always uses the station identity, not a leftover user login from a deploy.
• Added a clearer error message when a user login reaches a station-only command, pointing to the exact fix.