SSH keys added via WebGUI user page are ignored by sshd

Unraid version: 7.3.2

Description

SSH public keys added through the WebGUI (Users > root > SSH authorized keys) are written to
/root/.ssh/authorized_keys, but sshd_config is configured with:

AuthorizedKeysFile /etc/ssh/%u.pubkeys

This means sshd never reads the keys saved by the GUI. SSH key authentication silently fails and falls back to
password, with no indication to the user that anything is wrong.

Steps to reproduce

1. Go to Users > root in the WebGUI
2. Paste an SSH public key into the "SSH authorized keys" field
3. Click Save
4. Try to SSH in using that key — authentication fails
5. Compare the files:
   - GUI writes to: /root/.ssh/authorized_keys
   - sshd reads from: /etc/ssh/root.pubkeys (per sshd_config)

Workaround

Manually add the key to both /etc/ssh/root.pubkeys and /boot/config/ssh/root.pubkeys.

Expected behavior

The WebGUI should write SSH keys to /etc/ssh/root.pubkeys and /boot/config/ssh/root.pubkeys to match the
AuthorizedKeysFile setting in sshd_config.

Start at the WebGUI Users > root page and trace how the SSH authorized keys field is saved. Compare that behavior with sshd_config's AuthorizedKeysFile setting and the listed /root/.ssh/authorized_keys, /etc/ssh/root.pubkeys, and /boot/config/ssh/root.pubkeys paths. Done means a key saved through the GUI is available to sshd and persists as expected.