tracking: promotion view/click event types + storefront beacons (submodule bumps backoffice, slask-tracking)

event/event.go

@@ -81,6 +81,17 @@ const (
 	// 5 hand-written `pevent.Type("track.purchase")` literals with this
 	// typed constant.
 	TrackPurchase Type = "track.purchase"
+	// TrackPromotionView / TrackPromotionClick — storefront promotion
+	// attribution. Producer: the storefront promotion-badge islands, PLP
+	// promo badges, bundle picker and cart bundle upsell (lib/track.ts
+	// beacons → POST /api/track/promotion). Consumer: slask-tracking
+	// (pkg/view PromoStats) — per-promotion view/click counters for the
+	// promotions admin. Payload is the wire PromotionEvent (promotion id,
+	// action, placement, optional item id). These ride the browser beacon
+	// path only (no AMQP producer today), so they stay out of the
+	// `track.*` RabbitMQ routing pattern by construction.
+	TrackPromotionView  Type = "track.promotion_view"
+	TrackPromotionClick Type = "track.promotion_click"
 
 	// Newsletter campaign attribution (review 3.8). Producer: the order
 	// service's MailerSend webhook receiver (cmd/order/newsletter-webhook.go)
@@ -196,6 +207,11 @@ var KnownTypes = []Type{
 	TrackSession, TrackSearch, TrackClick, TrackCart, TrackPurchase,
 	TrackImpression, TrackAction, TrackPageView, TrackPageEngaged,
 	TrackPageAction, TrackExperiment,
+	TrackPromotionView, TrackPromotionClick,
+	// Track* constants without a browser beacon: consumed over AMQP only,
+	// but the drift-guard test requires every declared Track* constant to
+	// appear here so the HTTP ?event_types= surface stays exhaustive.
+	TrackCampaignOpen, TrackCampaignClick,
 }
 
 // IsKnownType reports whether s matches one of the declared Track*