initData was creating an 'Admins' group with identical permissions to
the 'Administrators' group already created by initAdminUser, resulting
in two redundant groups on every fresh start. Removed the duplicate,
dropped the now-unused groupRepo parameter, and corrected the log
message which claimed 50 persons were created when only 4 were.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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