Enhanced the proof of payment attachment feature with the following improvements:
- Renamed field from `proofOfPaymentAttachmentType` to `proofOfPaymentType` for consistency
- Added "none" option allowing users to disable proof of payment attachments
- Changed default value from "combined" to "none" for better UX
- Repositioned section in form after payment instructions (more logical flow)
- Added conditional warning when "combined" is selected without payment method
- Updated translations with emojis and improved tooltips for all options
- Backend validation and database operations updated to support new field structure
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Co-Authored-By: Claude <noreply@anthropic.com>