Add Transaction Export Functionality

[llinsss]

Description:
Users need to export transaction history in CSV/PDF formats for accounting.

Tasks:

• Create export service
• Add CSV generation
• Add PDF generation with formatting
• Implement background job for large exports
• Add email delivery for completed exports

Files to create:

• backend/services/ExportService.js
• backend/controllers/exportController.js
• backend/queues/export.js

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[Shadow-MMN]

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

Hi, please can I take this issue. ETA 6hrs

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

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