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/features/platform-homepage.md

@@ -497,12 +497,12 @@ content_page_service.create_page(
 
 **Get page content:**
 ```bash
-GET /api/v1/shop/content-pages/about
+GET /api/v1/storefront/content-pages/about
 ```
 
 **Get navigation:**
 ```bash
-GET /api/v1/shop/content-pages/navigation
+GET /api/v1/storefront/content-pages/navigation
 ```
 
 ---
@@ -681,11 +681,11 @@ PUT    /api/v1/admin/content-pages/{id}         # Update page
 DELETE /api/v1/admin/content-pages/{id}         # Delete page
 ```
 
-### Shop (Public) Endpoints
+### Storefront (Public) Endpoints
 
 ```
-GET /api/v1/shop/content-pages/navigation       # Get nav links
-GET /api/v1/shop/content-pages/{slug}           # Get page content
+GET /api/v1/storefront/content-pages/navigation       # Get nav links
+GET /api/v1/storefront/content-pages/{slug}           # Get page content
 ```
 
 ---