Update promo assets on talent records from webhooks

Incoming webhook promo links aren't applied to talent records, leaving booking managers without updated assets. Keep records current so coordinators can prepare promotions and confirm bookings same day.

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Overview

Webhooked promo links that never reach talent records create last-minute work and risk missed bookings. This flow applies incoming asset links directly to talent records so booking managers and program coordinators see current portfolios and can confirm promotions same day.