Feature: Add fallback ip detection

[BornToBeRoot]

Changes proposed in this pull request

• Add Fallback IP detection via Network Interface

Related issue(s)

• Close Dashboard - Enhance local IP detection #3294

To-Do

• Update changelog to reflect this changes

Contributing

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• I have read and understood the contributing guidelines and the code of conduct.
• I have have added my name, username or email to the contributors list or don't want to.
• The code or resource is compatible with the GNU General Public License v3.0.

[Copilot]

Pull request overview

This PR adds fallback IP detection functionality that attempts to detect local IP addresses via network interfaces when the routing-based detection method fails. This improves reliability in scenarios where routing-based detection is unavailable or unsuccessful.

Key Changes:

• Added fallback mechanism using DetectLocalIPAddressFromNetworkInterfaceAsync when routing-based IP detection returns null
• Implemented for both IPv4 and IPv6 address detection in both CheckConnectionComputerAsync and CheckConnectionRouterAsync methods
• Added debug logging for fallback attempts in CheckConnectionComputerAsync

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