cli: support ECIES encryption for device configs

[vkhoroz]

No description provided.

[Copilot]

Pull request overview

Adds optional ECIES encryption support to the satcli configs set command for device-specific configuration uploads by fetching the device’s stored public key and encrypting config values before submitting them to the server.

Changes:

• Introduces --encrypt/-e for configs set and encrypts config values with ECIES (base64-encoded ciphertext) when used with --device.
• Refactors the CLI configs API to use a SpecificConfigsApi interface and expands the device API to expose GetPubkey().
• Updates module dependencies to include github.com/foundriesio/go-ecies.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
go.mod	Adds github.com/foundriesio/go-ecies dependency.
go.sum	Records checksums for the new ECIES dependency.
cli/subcommands/configs/set.go	Adds --encrypt/-e, encrypts device config file values via ECIES, and fetches device pubkey for encryption.
cli/subcommands/configs/cmd.go	Adjusts device API selection to return the device configs API object (enables pubkey access).
cli/api/configs.go	Refactors SpecificConfigsApi into an interface, introduces specificConfigsApi implementation, and adds DeviceConfigsApi.GetPubkey().

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