[client] Change default interface name from wt0 to nb0

[lixmal]

Describe your changes

Issue ticket number and link

Stack

Checklist

• Is it a bug fix
• Is a typo/documentation fix
• Is a feature enhancement
• It is a refactor
• Created tests that fail without the change (if possible)
• Extended the README / documentation, if necessary

By submitting this pull request, you confirm that you have read and agree to the terms of the Contributor License Agreement.

[Copilot]

Pull Request Overview

This PR changes the default WireGuard interface name from "wt0" to "nb0" across the NetBird client codebase. This appears to be a branding change to better align the interface naming with the NetBird product name.

Key changes:

• Updates the default interface name constant from "wt0" to "nb0"
• Updates interface blacklist to include both old and new naming conventions
• Updates test mocks and fixtures to use the new naming convention

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
client/iface/configurer/name.go	Updates the WgInterfaceDefault constant from "wt0" to "nb0"
client/internal/config.go	Adds "nb" to the interface blacklist while keeping "wt" for compatibility
client/internal/engine_test.go	Updates test interface name generation to use "nb" prefix
client/internal/netflow/manager_test.go	Updates mock interface name from "wt0" to "nb0"
client/internal/routemanager/systemops/systemops_test.go	Updates test fixture interface name from "wt0" to "nb0"

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Robert4908]

This would break a lot of our firewall (ufw) exceptions!

[lixmal]

@Robert4908 this doesn't affect existing installations