Split blogs and other modules into child sitemaps.

Move blogs, portfolios, videos, instructions, and workshops out of sitemap-main into dedicated files like products, and allow saving migrated Farsi category color labels without wiping store-item links.

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

docs/website-api/AI_PROMPT.md

@@ -138,9 +138,14 @@ Minimal example:
 - When linking from lists/cards, use the same `{id}/{slug}` shape for details (slugify Farsi title: spaces → `-`, keep Persian letters). Category links use `/products/category/{id}/{nameFaSlug}`.
 - Omit `templates` in `sitemap-config.json` unless this site uses non-default paths.
 - **Sitemap files (proxied by nginx — do not ship local copies):**
-  - `/sitemap.xml` — sitemap **index**
-  - `/sitemap-main.xml` — static pages + categories + blogs + portfolios
+  - `/sitemap.xml` — sitemap **index** (lists child sitemaps for enabled modules)
+  - `/sitemap-main.xml` — static pages + product categories
   - `/sitemap-products.xml` — published products (when products module is enabled)
+  - `/sitemap-blogs.xml` — published blogs (when blog module is enabled)
+  - `/sitemap-portfolios.xml` — published portfolios (when portfolio module is enabled)
+  - `/sitemap-videos.xml` — published videos (when videos module is enabled)
+  - `/sitemap-instructions.xml` — published instructions (when instructions module is enabled)
+  - `/sitemap-workshops.xml` — published workshops (when workshops module is enabled)
   - `/robots.txt` — points at `/sitemap.xml`
 
 ### On-page SEO (every public page)