make show-admin-password — prints the admin password from the initial
setup file if the API hasn't consumed it yet; otherwise prompts to reset
make reset-admin-password — generates a strong random password, updates
auth_users.json directly, writes it back to the setup file, and prints
it prominently so it's easy to copy
Also enhances reset_admin_password.py with --show, --generate flags and
a clear banner output, and adds both targets to make help.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>