[Medium] Add credential security audits

[Josie123-Dev]

Task Description

Implement security audit functionality in contracts:

• Audit credential operations
• Track suspicious activity
• Implement security checks
• Generate audit reports
• Emit audit events

Requirements

• Operation auditing
• Activity tracking
• Security checks
• Report generation
• Event emission

Acceptance Criteria

• Operations are audited
• Activity is tracked
• Checks are implemented
• Reports are generated
• Events are emitted

[rohan911438]

Would love to work on it

[grantfox-oss]

🦊 GrantFox — @rohan911438 has been assigned to this issue as part of the Official Campaign campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #94)
2. Your PR will be reviewed by the GuardZero144 maintainers

Good luck! Track your progress on GrantFox.

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign campaign!

@rohan911438's PR #113 was approved and merged by @Josie123-Dev.

🏆 @rohan911438: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (468 total points). Track your full progress on GrantFox.

👏 Great work, @rohan911438! Keep contributing to GuardZero144.