Implement batch subscription operations for bulk management

[Smartdevs17]

Implement batch subscription operations for bulk management

Description

Context: Merchants managing many subscriptions need bulk operations for efficiency.

Current Limitation: Operations are single-subscription only.

Expected Outcome: Implement batch operations for creating, updating, and charging multiple subscriptions at once.

Acceptance Criteria

• Implement BatchOperation: operation_type, subscription_ids[], params
• Add batch creation from CSV template
• Implement batch charging with transaction aggregation
• Add batch status tracking with progress reporting
• Support partial batch success handling
• Implement rollback on batch failure
• Add batch operation history and audit
• Create React Native batch operations UI
• Write tests for batch operations

Technical Scope

Files Likely Affected:

• contracts/batch/src/lib.rs - New batch module
• app/stores/batchStore.ts - Batch state
• app/screens/BatchOperationsScreen.tsx

APIs/Contracts Involved:

• create_batch_operation(op: BatchOperation) -> BatchId
• execute_batch(batch_id: BatchId) -> BatchResult
• get_batch_status(batch_id: BatchId) -> BatchStatus

Edge Cases to Consider:

• Large batch timeouts
• Partial success scenarios

[christy-dev4]

@christy-dev4 has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

I will like to work on this pls

ℹ️ Repo Maintainers: To accept this application, review their application or assign @christy-dev4 to this issue.