CONTRACTS: Add Token Pause/Unpause Functionality

[truthixify]

Description
Implement emergency pause mechanism to temporarily halt all token operations during security incidents or maintenance periods.

Files to Modify

• contracts/manage_hub/src/lib.rs - Add pause/unpause endpoints
• contracts/manage_hub/src/state.rs - Add pause state management
• contracts/manage_hub/src/membership_token.rs - Add pause checks
• contracts/manage_hub/src/guards.rs - Add pause guard middleware

Key Changes Required

• Pause State - Add global and per-token pause states
• Pause Guards - Implement guards to block operations when paused
• Admin Controls - Add admin-only pause/unpause functions
• Event Logging - Emit events for pause state changes
• Granular Control - Support pausing specific operations
• Time-based Unpause - Add automatic unpause after specified duration

Acceptance Criteria

• Implement pause and unpause functions with admin authorization
• Add pause state to contract storage
• Block token transfers when paused
• Block minting operations when paused
• Emit PauseStateChanged events
• Add query function to check pause status
• Support per-token pause functionality
• Implement emergency pause with time lock

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[IbrahimIjai]

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

I would love to work on this issue, I have over 1year of experience working with rust (axum and anchor) and over 4years of experience writing smart contracts with solidity. I picked up soroban about 2 months ago and would definitely deliver this perfectly

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[AbdulSnk]

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

hi iwould like to wok on this. i have relevnt skills and experience to implement this professionally

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[7maylord]

@7maylord has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hi, I have experience with soroban smart contracts, can i work on this issue.

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Congratulations, @7maylord! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

🧑‍💻 @7maylord: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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This issue has been completed by @7maylord as part of the Stellar Wave Program's 2nd Wave 🥳

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