Update default Ubuntu image to 25.10 and extract slug constants#48

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ret2libc wants to merge 2 commits intomainfrom

update-ubuntu-image

Commits on Mar 13, 2026

Update default Ubuntu image from 25.04 to 25.10

ret2libc
and
claude
committed
Extract default region/size/image slugs into constants

ret2libc
and
claude
committed