Added two download routes for proof of payment files:
1. Combined route: /share/proof-of-payment/combined/[id]/
- Downloads location-level proof of payment for all utilities
- Queries utilBillsProofOfPayment from location
- Optimized projection for efficient data transfer
2. Per-bill route: /share/proof-of-payment/per-bill/[id]/
- Downloads proof of payment for individual bills
- Parses composite ID format: locationID-billID
- Finds specific bill in location's bills array
- Returns bill.proofOfPayment
Both routes:
- Return PDF files with proper Content-Type and headers
- Handle 404 for missing locations/bills/proofs
- Use Base64 to binary conversion for file delivery
- Include Last-Modified header for caching
- Use optimized database projections
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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