feat(catalog): adopt subject-aware availability contract

src/app/core/services/catalog/catalog-availability.ts

@@ -1,9 +1,11 @@
 import { CatalogAvailability } from './catalog.interface';
 
 export const AVAILABLE_CATALOG_AVAILABILITY: CatalogAvailability = {
+  subject: 'product',
   maximum_quantity: null,
   restrictions: [],
   capabilities: {
+    display: true,
     select_variant: true,
     change_quantity: true,
     add_to_cart: true,
@@ -11,21 +13,25 @@ export const AVAILABLE_CATALOG_AVAILABILITY: CatalogAvailability = {
   },
 };
 
-export function createCatalogAvailability(maximumQuantity: number | null): CatalogAvailability {
+export function createCatalogAvailability(
+  maximumQuantity: number | null,
+  subject: CatalogAvailability['subject'] = 'product',
+): CatalogAvailability {
   const unavailable = maximumQuantity === 0;
 
   return {
+    subject,
     maximum_quantity: maximumQuantity,
     restrictions: unavailable
       ? [
           {
             code: 'out_of_stock',
             message: 'Este producto no tiene stock disponible.',
-            scope: 'product',
           },
         ]
       : [],
     capabilities: {
+      display: !unavailable,
       select_variant: !unavailable,
       change_quantity: !unavailable,
       add_to_cart: !unavailable,

src/app/core/services/catalog/catalog.interface.ts

@@ -52,10 +52,10 @@ export type InventoryPolicy = 'tracked' | 'unlimited';
 export interface CatalogRestriction {
   code: 'out_of_stock' | 'user_quota_reached' | string;
   message: string;
-  scope: 'product' | 'variant' | string;
 }
 
 export interface CatalogCapabilities {
+  display: boolean;
   select_variant: boolean;
   change_quantity: boolean;
   add_to_cart: boolean;
@@ -63,6 +63,7 @@ export interface CatalogCapabilities {
 }
 
 export interface CatalogAvailability {
+  subject: 'product' | 'variant';
   maximum_quantity: number | null;
   restrictions: CatalogRestriction[];
   capabilities: CatalogCapabilities;

src/app/shared/components/variant-selector/variant-selector.component.ts

@@ -24,6 +24,7 @@ export interface VariantSelectorVariant {
   values: Record<string, VariantAttributeValue>;
   availability?: {
     capabilities: {
+      display: boolean;
       select_variant: boolean;
     };
   };