feat: catalog read cache (api + user apps) and clearer Zarrin accounting errors

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/src/modules/catalog/catalog.service.ts

@@ -1,15 +1,22 @@
 import { BadRequestException, Injectable, NotFoundException } from '@nestjs/common';
 import { PrismaService } from '../../prisma/prisma.service';
 import { AccountingHooksService } from '../accounting-sync/accounting-hooks.service';
+import { CatalogCacheService } from './catalog-cache.service';
 
 @Injectable()
 export class CatalogService {
   constructor(
     private readonly prisma: PrismaService,
     private readonly accounting: AccountingHooksService,
+    private readonly catalogCache: CatalogCacheService,
   ) {}
 
-  async listProducts() {
+  /** Served from CatalogCacheService; see there for what invalidates it. */
+  listProducts() {
+    return this.catalogCache.get(() => this.buildProductList());
+  }
+
+  private async buildProductList() {
     const products = await this.prisma.product.findMany({
       // D27 — a product with no image is never shown in the app. Products now
       // also arrive from the accounting software, which carries no pictures;
@@ -34,6 +41,7 @@ export class CatalogService {
       },
     });
 
+    const stockBlocked = await this.accounting.stockBlocker();
     const out = [];
     for (const p of products) {
       const { accountingStockWeight, accountingStockCount, accountingStockAt, ...product } = p;
@@ -41,7 +49,7 @@ export class CatalogService {
       // qty 0, which the apps already render as «ناموجود» and refuse to add to
       // the cart unless it is a pre-order variant. The stock figures themselves
       // stay server-side; this endpoint is public.
-      const blocked = await this.accounting.stockBlocked({ accountingStockWeight, accountingStockCount, accountingStockAt });
+      const blocked = stockBlocked({ accountingStockWeight, accountingStockCount, accountingStockAt });
       out.push(blocked ? { ...product, variants: product.variants.map((v) => (v.isPreOrder ? v : { ...v, qty: 0 })) } : product);
     }
     return out;