docs: add consolidated dev URL reference and migrate /shop to /storefront

- Add Development URL Quick Reference section to url-routing overview
  with all login URLs, entry points, and full examples
- Replace /shop/ path segments with /storefront/ across 50 docs files
- Update file references: shop_pages.py → storefront_pages.py,
  templates/shop/ → templates/storefront/, api/v1/shop/ → api/v1/storefront/
- Preserve domain references (orion.shop) and /store/ staff dashboard paths
- Archive docs left unchanged (historical)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/getting-started/cms-quick-start.md

@@ -93,7 +93,7 @@ POST /api/v1/store/{store_code}/content-pages
 
 **Public - Retrieve Page:**
 ```bash
-GET /api/v1/shop/content-pages/{slug}
+GET /api/v1/storefront/content-pages/{slug}
 ```
 
 ## How the Two-Tier System Works