Fix CPM hallucination: pricing_type enum + quote validation#7

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atc964 wants to merge 2 commits intomainfrom

feature/cpm-hallucination-fix

Commits on Mar 31, 2026

Add PricingType enum to seller product/package models

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claude
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Add seller-side quote validation (Layer 4 — CPM hallucination defense)

atc964
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claude
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