CONTRACTS: Implement Access Control Lists (ACL)

[truthixify]

Description
Add granular permission system with role-based access control for managing different levels of authorization across contract operations.

Files to Modify

• contracts/manage_hub/src/acl.rs - Create ACL module
• contracts/manage_hub/src/roles.rs - Define role structures
• contracts/manage_hub/src/guards.rs - Add ACL guards
• contracts/manage_hub/src/lib.rs - Add ACL endpoints

Key Changes Required

• Role Definition - Define different roles (admin, minter, burner, etc.)
• Permission Assignment - Assign permissions to roles
• Role Management - Add/remove roles from addresses
• Permission Checks - Implement guards for protected operations
• Role Hierarchy - Support role inheritance
• Time-based Roles - Add temporary role assignments

Acceptance Criteria

• Implement grant_role and revoke_role functions
• Add has_role query function
• Define standard roles (admin, minter, pauser, etc.)
• Implement role-based guards for all operations
• Emit RoleGranted and RoleRevoked events
• Support role renunciation by role holders
• Add get_role_members query function
• Implement role admin hierarchy

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[ryzen-xp]

@ryzen-xp has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hi maintainers 👋
I’m a blockchain developer with strong expertise in Stellar, Rust,TS and Stellar SDK integrations. I’ve worked on multiple Stellar-based smart contract and backend systems.

I understand the scope of this issue and can deliver a reliable, production-quality solution with proper tests and documentation.
Plz assign me !!

ETA: 24 hours

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[Timi16]

@Timi16 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I would love to work on this

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[drips-wave]

Congratulations, @Timi16! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

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