* fix(core): add IPv6 fallback support to get_current_ip functions
Fixes IP detection in IPv6-only environments by adding fallback:
- Try IPv4 first (existing behavior)
- Fall back to IPv6 via interface lookup (eth0 scope global)
- Fall back to IPv6 routing with Google/Cloudflare DNS targets
Closes #issue-ipv6-only-environment
* fix(build): use SSH_AUTHORIZED_KEY from user defaults when no SSH_KEYS_FILE exists
When using 'User Defaults' with var_ssh_authorized_key set in default.vars,
the SSH key was not being installed because install_ssh_keys_into_ct() only
checked for SSH_KEYS_FILE (which is only created in Advanced Settings).
Now the function also checks SSH_AUTHORIZED_KEY and creates a temporary
SSH_KEYS_FILE if needed.
Fixes#11062
eb596d2364