[Hard] Add credential access permission system

[Josie123-Dev]

Task Description

Implement granular credential access permission system:

• Define permission levels
• Implement permission checks
• Support role-based access
• Manage permission grants
• Audit permission changes

Requirements

• Define permission model
• Implement checks
• Support roles
• Manage grants
• Audit changes

Acceptance Criteria

• Permissions are enforced
• Checks work correctly
• Roles are supported
• Grants are managed
• Changes are audited

[balisdev]

Hii, I'd like to work on this issue, I'll ensure I define permission model, implement the required checks, support roles, manage grants, audit changes. Please kindly assign this to me. To be complete within the next 6-8 hours

[grantfox-oss]

🦊 GrantFox — @balisdev has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #51)
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 | FWC26 campaign!

@balisdev's PR #128 was approved and merged by @Josie123-Dev.

🏆 @balisdev: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (522 total points). Track your full progress on GrantFox.

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