[Hard] Implement credential upgrade mechanism

[Josie123-Dev]

Task Description

Implement robust credential contract upgrade mechanism:

• Design upgrade pattern
• Implement proxy pattern
• Handle data migration
• Maintain state consistency
• Ensure security

Requirements

• Upgrade pattern
• Proxy implementation
• Data migration
• State consistency
• Security measures

Acceptance Criteria

• Pattern is designed
• Proxy works
• Data is migrated
• State is consistent
• Security is maintained

[Wilfred007]

I have the prefect experience to work on this task, kindly assign to me and it will be completed within ETA

[grantfox-oss]

🦊 GrantFox — @Wilfred007 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 #101)
2. Your PR will be reviewed by the GuardZero144 maintainers

Good luck! Track your progress on GrantFox.

[Wilfred007]

Thank you for assigning this task, expect a PR in within 4 hours. Cheers

[grantfox-oss]

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

@Wilfred007's PR #112 was approved and merged by @Josie123-Dev.

🏆 @Wilfred007: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (153 total points). Track your full progress on GrantFox.

👏 Great work, @Wilfred007! Keep contributing to GuardZero144.