refactor(tui): reorder main menu into logical groups
Menu had grown by prepending each new feature to the top, so items had no relation to their neighbors. Grouped into Export/Import, Bulk operations, Baselines & compliance, Reporting, Tenant & auth admin, with Exit last. Item numbers (used for dispatch) unchanged, only display order moved. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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