feat: implement catalog service and product attribute selector component for product details

src/app/core/services/api-response.interface.ts

@@ -1,3 +1,5 @@
 export interface ApiResponse<T> {
   data: T;
+  message?: string;
+  errors?: Record<string, string[]>;
 }

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

@@ -35,9 +35,14 @@ export class CatalogService {
     );
   }
 
-  getProducto(id: number): Observable<ProductDetail> {
+  getProducto(id: number, variantId?: number): Observable<ProductDetail> {
+    let params = new HttpParams();
+    if (variantId) {
+      params = params.set('variant_id', variantId);
+    }
+    
     return this.http
-      .get<ApiResponse<ProductDetail>>(`${this.tenantApiUrl}/productos/${id}`)
+      .get<ApiResponse<ProductDetail>>(`${this.tenantApiUrl}/productos/${id}`, { params })
       .pipe(map((response) => response.data));
   }