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>

docs/website-api/openapi.json

@@ -195,7 +195,7 @@
           "SEO"
         ],
         "summary": "XML sitemap for search engines",
-        "description": "Published products, blogs, and portfolios for this tenant (respects enabled modules), plus static pages and URL templates from the synced website manifest (`GET https://{domain}/meshkee/sitemap-config.json`). Default detail paths: `/products/{id}/{nameFaSlug}`, `/blog/{id}/{titleSlug}`, `/portfolios/{id}/{titleFaSlug}`. Proxied from `https://{domain}/sitemap.xml` on the storefront. Cached in Redis; refreshed after CMS writes and manifest sync.",
+        "description": "Published products, product categories, blogs, and portfolios for this tenant (respects enabled modules), plus static pages and URL templates from the synced website manifest (`GET https://{domain}/meshkee/sitemap-config.json`). Default detail paths: `/products/{id}/{nameFaSlug}`, `/products/category/{categorySlug}`, `/blog/{id}/{titleSlug}`, `/portfolios/{id}/{titleFaSlug}`. Proxied from `https://{domain}/sitemap.xml` on the storefront. Cached in Redis; refreshed after CMS writes and manifest sync.",
         "parameters": [
           {
             "$ref": "#/components/parameters/domain"
@@ -446,6 +446,49 @@
         }
       }
     },
+    "/tenants/{domain}/categories/by-slug/{slug}": {
+      "get": {
+        "tags": [
+          "Categories"
+        ],
+        "summary": "Category by slug (for /products/category/{categorySlug} pages)",
+        "parameters": [
+          {
+            "$ref": "#/components/parameters/domain"
+          },
+          {
+            "name": "slug",
+            "in": "path",
+            "required": true,
+            "schema": {
+              "type": "string"
+            }
+          },
+          {
+            "name": "entityType",
+            "in": "query",
+            "schema": {
+              "type": "string",
+              "enum": [
+                "product",
+                "blog",
+                "portfolio",
+                "video"
+              ],
+              "default": "product"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "{ category } — use category.id as categoryId when listing products"
+          },
+          "404": {
+            "description": "Category not found"
+          }
+        }
+      }
+    },
     "/tenants/{domain}/products": {
       "get": {
         "tags": [