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/api/storefront-api-reference.md

@@ -92,7 +92,7 @@ Get paginated list of products for current store.
 
 ```http
 GET /api/v1/storefront/products?skip=0&limit=20&is_featured=true
-Referer: http://localhost:8000/stores/orion/shop/products
+Referer: http://localhost:8000/storefront/orion/products
 ```
 
 **Response (200 OK):**
@@ -142,7 +142,7 @@ Get detailed information for a specific product.
 
 ```http
 GET /api/v1/storefront/products/1
-Referer: http://localhost:8000/stores/orion/shop/products
+Referer: http://localhost:8000/storefront/orion/products
 ```
 
 **Response (200 OK):**
@@ -200,7 +200,7 @@ Retrieve cart contents for a session.
 
 ```http
 GET /api/v1/storefront/cart/session-abc-123
-Referer: http://localhost:8000/stores/orion/shop/cart
+Referer: http://localhost:8000/storefront/orion/cart
 ```
 
 **Response (200 OK):**