This PR adds a feature to prevent users from creating a new account with a reserved username such as root, admin, system, proxy, info, etc...
Reserved usernames can be configured via the config file.
The administrator can create an account with a reserved username via the first setup screen or the control panel.
The existing account of reserved usernames will not be affected.
Co-authored-by: Namekuji <nmkj@mx.kazuno.co>
Reviewed-on: https://codeberg.org/calckey/calckey/pulls/9917
Co-authored-by: Namekuji <nmkj@noreply.codeberg.org>
Co-committed-by: Namekuji <nmkj@noreply.codeberg.org>
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