Offer waterfall design for bursty pop traffic

Pop traffic can arrive in sharp bursts, so a campaign page should not fail just because the advertiser supplied too few prize entries.

The first layer should always be campaign prizes. If those slots are not enough, the platform can fill with active self offers matched by geo and device. SmartLink is the final fallback.

Keeping this logic at the game-config edge path makes the visitor experience reliable while preserving Supabase for business state and audit trails.