dockerInstallApp built the installer name by upper-casing only the first
letter of the slug (libreportal -> installLibreportal), which can't match
camelCase installers like installLibrePortal. After the EasyDocker ->
LibrePortal rename this broke `libreportal` installs with
"installLibreportal: command not found".
If the naive name isn't a defined function, resolve it case-insensitively
against the function table (compgen -A function), and fail with a clear
message if nothing matches. Works for any compound brand/app name.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
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