* Update default Ubuntu image from 25.04 to 25.10
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
* Extract default region/size/image slugs into constants
Replace duplicated hardcoded strings across config.py, main.py, and
tests with DEFAULT_REGION, DEFAULT_SIZE, and DEFAULT_IMAGE constants
defined in config.py.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
---------
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Riccardo Schirone