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- Add POST /attachments for secure multi-file upload with validation - Add GET /attachments for listing transaction attachments - Add GET /attachments/:id for attachment metadata retrieval - Add GET /attachments/:id/download for secure file download - Add DELETE /attachments/:id for soft deletion - Include comprehensive security validation: file type, size, content detection - Implement proper error handling and cleanup on failures 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>