Knee Cola a6ab35a959 feat: add core security utilities for checksum-based share links ...

- Add HMAC-SHA256 checksum generation and validation (shareChecksum.ts)
- Add PDF magic bytes validation to prevent file spoofing (pdfValidator.ts)
- Add IP-based rate limiting for upload abuse prevention (uploadRateLimiter.ts)
- Update BillingLocation interface with shareTTL and shareFirstVisitedAt fields
- Add environment variables for share link security and TTL configuration

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

2025-12-08 00:14:20 +01:00

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