Include product category URLs in sitemaps and document by-slug lookup.

Adds /products/category/{slug} to default sitemap generation and a public categories/by-slug endpoint for storefront category pages.

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

src/categories/categories.module.ts

@@ -1,5 +1,6 @@
 import { Module } from '@nestjs/common';
 import { AuthModule } from '../auth/auth.module';
+import { SitemapModule } from '../sitemap/sitemap.module';
 import { TenantModule } from '../tenant/tenant.module';
 import { CategoriesController, PublicCategoriesController } from './categories.controller';
 import { CategoriesService } from './categories.service';
@@ -9,7 +10,7 @@ import { CategoryTechnicalFormService } from './category-technical-form.service'
 import { CategoryVariationsService } from './category-variations.service';
 
 @Module({
-  imports: [AuthModule, TenantModule],
+  imports: [AuthModule, SitemapModule, TenantModule],
   controllers: [CategoriesController, PublicCategoriesController],
   providers: [
     CategoriesService,