- Renamed BillAttachment to FileAttachment for better generalization
- Added uploadedAt field to FileAttachment (consolidates timestamp)
- Renamed utilBillsProofOfPaymentAttachment to utilBillsProofOfPayment
- Removed separate utilBillsProofOfPaymentUploadedAt field (now in FileAttachment)
- Added rentProofOfPayment field to BillingLocation for rent-specific proof
- Added proofOfPayment field to Bill interface for per-bill attachments
- Removed unused imports (ObjectId, inter)
This refactoring enables both "combined" (location-level) and "per-bill"
proof of payment attachment strategies.
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Co-Authored-By: Claude <noreply@anthropic.com>
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