CONTRACTS: Add Batch Operations Support

[truthixify]

Description
Implement batch operations for minting, transferring, and updating multiple tokens in a single transaction to improve efficiency and reduce gas costs.

Files to Modify

• contracts/manage_hub/src/batch.rs - Create batch operations module
• contracts/manage_hub/src/lib.rs - Add batch endpoints
• contracts/manage_hub/src/membership_token.rs - Add batch helpers
• contracts/manage_hub/src/validation.rs - Add batch validation

Key Changes Required

• Batch Minting - Mint multiple tokens in one transaction
• Batch Transfer - Transfer multiple tokens to different recipients
• Batch Update - Update multiple token properties at once
• Validation - Validate all operations before execution
• Atomic Operations - Ensure all-or-nothing execution
• Gas Optimization - Optimize for lower gas consumption

Acceptance Criteria

• Implement batch_mint function for multiple tokens
• Add batch_transfer for multiple recipients
• Create batch_update for property updates
• Validate all batch operations before execution
• Rollback all changes if any operation fails
• Emit batch operation events
• Add batch size limits to prevent DoS
• Optimize gas usage for batch operations

[drips-wave]

This issue has been added to the Stellar Wave Program and is worth 200 Points.

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[meshackyaro]

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

Hi, I'll like to work on issue #503: Add Batch Operations Support.
I'm a Blockchain Engineer/Software Engineer with experience in building scalable systems and web applications, I'm comfortable with Smart Contract and Backend development. I'll like this task to be assigned to me because I am fast and precise with my approach, also I have great debugging skills.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @meshackyaro to this issue.

[Rampop01]

@Rampop01 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I would like to work on this issue. I understand the assignment and the requirements, and the approach needed to deliver the solution.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Rampop01 to this issue.

[drips-wave]

Congratulations, @Rampop01! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

🧑‍💻 @Rampop01: 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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