Move ledger keychain implementation to dedicated package

[felipemadero]

Why this should be merged

This refactoring improves code organization by separating ledger-specific implementation from the generic keychain interfaces. The current structure mixes generic keychain interfaces with ledger-specific implementation details in the same package, making it harder to maintain and extend.

How this works

• Package reorganization: All ledger-related functionality (ledgerKeychain, ledgerSigner, ledger interfaces, tests, and mocks) is moved to utils/crypto/keychain/ledger/
• Interface preservation: The core Signer and Keychain interfaces remain in the main keychain package unchanged
• Ledger device constructor now returns a concrete *Ledger struct while the ledger keychain package defines a Ledger interface for its dependency needs, enabling clean testing and dependency injection

How this was tested

• unit tests

Need to be documented in RELEASES.md?

[Copilot]

Pull Request Overview

This PR refactors the codebase by extracting ledger-specific keychain functionality from the generic keychain package into a dedicated utils/crypto/keychain/ledger/ package, improving code organization and separation of concerns.

Key changes:

• Moves all ledger-related implementations (keychain, signer, interfaces, tests, mocks) to dedicated ledger package
• Updates ledger device constructor to return concrete type while maintaining interface-based design in the ledger package
• Renames functions to remove "Ledger" prefix since they're now in a ledger-specific package

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
utils/crypto/ledger/ledger.go	Updates constructor to return concrete *Ledger type and removes keychain interface dependency
utils/crypto/keychain/ledger/mocks_generate_test.go	Updates package declaration for moved mock generation
utils/crypto/keychain/ledger/ledgermock/ledger.go	Updates generated mock to reflect new package structure
utils/crypto/keychain/ledger/ledger_keychain_test.go	Updates tests to use new package and function names
utils/crypto/keychain/ledger/ledger_keychain.go	New implementation file containing moved ledger keychain logic
utils/crypto/keychain/ledger/ledger.go	Defines Ledger interface for the ledger package with verification
utils/crypto/keychain/keychain.go	Removes ledger-specific implementations, keeping only generic interfaces

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