[BUG] image list does not show pure-headless images

[sfabbro]

Bug Description

Steps to Reproduce

1. canfar image ls
2. canfar image ls | grep base

Expected Behavior

System Information

should show "headless-only" images, i.e. astroai/base:latest.

canfar version --debug
@staging

CANFAR Python Client Debug Information
 Client Version          1.4.1
 Source                  development/editable

 Python Version          3.13.14
 Python Executable       /home/ubuntu/.cache/uv/archive-v0/ujiwOixym9KrD5qz/bin/python
 Python Impl             CPython

 Operating System        Linux
 OS Version:             6.8.0-136-generic
 Architecture            x86_64
 Platform                Linux-6.8.0-136-generic-x86_64-with-glibc2.39

Key Dependencies
 Package                 Version
 httpx                   0.28.1
 typer                   0.27.0
 rich                    15.0.0
 pydantic                2.13.4
 cadcutils               1.6.2

Additional Information
• Repository: https://github.com/opencadc/canfar
• Issues: https://github.com/opencadc/canfar/issues
• Documentation: https://opencadc.github.io/canfar/

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Error Messages and Logs

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Additional Context

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