feat(promo): Política B — effectivePrice + Appwrite RT (web/Android)

[danielitoCode]

Política B (promociones)

Alineación de clientes con dash_alejo_taller política B:

• product.price = precio de lista
• effectivePrice desde promo product_discount activa
• Banner sin producto permitido
• Realtime canónico: Appwrite collections.promotions.documents
• Operador: sin cambios (amount congelado en Sale)

Incluido en este PR (parcial / en progreso)

Web

• Entity + DTO + mapper (productId, kind, status)
• Policy doc .policies/notification/PROMOTION_POLICY.md

Android

• Promotion + PromotionPricing.effectivePrice (shared-core)
• DTO/mappers ampliados
• Room v13 (pendiente subir migration file si falta en remote)

Pendiente de completar en la misma rama (workspace local)

Si al revisar faltan archivos, están en el working tree local policy/promotions-b:

• web/.../PromotionPolicy.ts
• web/.../appwrite-promotion-realtime.ts
• web/.../promotion.store.ts (Appwrite RT en lugar de Pusher)
• ProductCard.svelte + cart.store.ts (unitPrice efectivo)
• RealTimeManagerImpl.kt (subscribe Appwrite promos)
• ProductListItem.kt / ProductScreen.kt
• AppBDMigrations.kt MIGRATION_12_13

Cómo probar

1. Appwrite: lectura pública/staff de promotions + atributos kind/status opcionales
2. Crear promo product_discount en panel → clientes deben ver precio efectivo
3. Banner sin productId → UI avisos, sin cambiar precio

[github-actions]

Qodana for JVM

4 new problems were found

Inspection name	Severity	Problems
Unstable API Usage	🔶 Warning	4

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