feat: Introduce SignerInfo struct for enhanced signer management

[SynnekOG]

PR Description

Summary

This PR introduces a new SignerInfo struct into MultiSigContractV2.sol to provide a standardized way of tracking metadata and activity related to individual signers. This is a foundational change that lays the groundwork for more robust signer management, governance, and auditing features in future updates.

Changes

• Added SignerInfo struct with the following fields:

  • bool active: Indicates if a signer is currently active.
  • uint256 addedAt: Timestamp of when the signer was added.
  • uint256 lastSignedAt: Timestamp of the most recent transaction the signer approved.
  • uint256 totalSigned: Number of transactions signed by this signer.
  • string role: Logical role assigned to the signer (e.g., admin, auditor, member).
  • uint256 reputation: Numeric score for evaluating signer trustworthiness or performance.

• Formatting

  • Applied forge fmt for codebase consistency.

Rationale

• Provides a flexible data model for managing and evaluating signers.
• Improves transparency by tracking signer activity and contributions.
• Enables role-based responsibilities and potential governance layers.
• Establishes a reputation system to help with accountability and trust metrics.

Impact

• No breaking changes to existing contract functionality.
• Sets up the foundation for role-based access control, advanced signer auditing, and potential slashing/reward mechanisms in later iterations.

Next Steps

• Integrate SignerInfo into signer management functions (add/remove/update).
• Implement role-based restrictions and checks.
• Utilize reputation in decision-making and voting weight mechanics.