bugfix(cli): prevent a user from adding a duplicate IP (#3056)

[bgm-malbeclabs]

Summary of Changes

This PR adds an IP duplicate check at the CLI (but not on the smart contract) to prevent a user from accidentally adding a duplicate IP. Devices are fetched, then filtered to the user's devices, and then the check is peformed on both create and update. If there is a duplicate detected, an error is returned.

Closes #3056

Testing Verification

• Unit test updated to validate that a duplicate IP on create and update returns an error

[Copilot]

Pull request overview

Adds a CLI-side safeguard to prevent assigning the same IPv4 network to multiple interfaces owned by the same contributor, addressing accidental duplicate on-chain interface IP assignments (Issue #3056).

Changes:

• Add duplicate ip_net detection across all devices belonging to the same contributor_pk during device interface create.
• Add the same duplicate ip_net detection during device interface update, while attempting to skip the interface being updated.
• Update unit tests to cover duplicate-IP failures for both create and update, and document the change in the changelog.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
smartcontract/cli/src/device/interface/update.rs	Parses --ip-net, checks for duplicates across contributor devices before issuing the update, and adds tests for duplicate-IP rejection.
smartcontract/cli/src/device/interface/create.rs	Checks for duplicates across contributor devices before creating an interface, and adds a test for duplicate-IP rejection.
CHANGELOG.md	Notes the new CLI duplicate-IP prevention behavior.

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