D-43: Add Contract State Backup and Restore

[Nanle-code]

Implement contract state backup and restore functionality, enabling disaster recovery and state migration between networks.

Proposed Changes:

• Implement state backup
• Add state restore
• Create backup scheduling
• Implement backup verification
• Add cross-network restore
• Create backup management UI

Acceptance Criteria:

• State backup works
• State restore
• Backup scheduling
• Backup verification
• Cross-network restore
• Management UI

Priority: Medium
Complexity: Medium
Labels: enhancement, backup, state

[emickwrld]

@emickwrld has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi, I’m a smart contract and a full-stack web developer, I have read through the issue and it’s something I’m capable of doing. Please assign me this work.

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