fix(bonding): add default link monitoring settings for bonding interfaces

[m-dilorenzi]

This pull request introduces default settings for link monitoring on network bonds, ensuring that all bonding interfaces have consistent and reliable monitoring parameters. The changes include both configuration script updates and default values in the device API.

Configuration automation for bond link monitoring:

• files/etc/uci-defaults/99-nethsec-bond-link-monitoring: Added a script to automatically set link_monitoring to 'mii' and miimon to '100' for all bonding interfaces if they are not already configured, improving bond reliability and consistency.

Default values in device API:

• packages/ns-api/files/ns.devices: Set default values for link_monitoring ('mii') and miimon ('100') in the bond device configuration dictionary, ensuring new bonds have proper monitoring settings by default.

Closes: #1446

[Copilot]

Pull request overview

This PR adds default link monitoring parameters for Linux bonding interfaces to ensure active-backup bonds reliably detect link-down events and fail over, addressing issue #1446.

Changes:

• Add API-side default bond options link_monitoring='mii' and miimon='100'.
• Add a /etc/uci-defaults migration script to backfill these options on existing bond configurations when missing.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
packages/ns-api/files/ns.devices	Adds default bond monitoring fields to the values written by the device API.
files/etc/uci-defaults/99-nethsec-bond-link-monitoring	Migration script to set bond monitoring defaults for existing configs if not already configured.

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