dockerComposeDown printed the 'Docker Compose down <app>' header then could
fall through silently: when the effective install type (passed type arg or
CFG_DOCKER_INSTALL_TYPE) was empty/unrecognised no branch ran, and on a
non-Ubuntu/Debian OS the whole block was skipped. Collapse the duplicated
type=='' vs type!='' branches into one mode fallback and add notices for the
unknown-mode and unsupported-OS cases so the header always has a result line.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
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