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/database-setup.md

@@ -292,7 +292,7 @@ python scripts/create_landing_page.py
 make dev
 
 # 6. Test the shop
-# Visit: http://localhost:8000/stores/orion/shop/
+# Visit: http://localhost:8000/storefront/orion
 ```
 
 ### Common Issues
@@ -307,7 +307,7 @@ python scripts/create_inventory.py
 ```bash
 # Solution: Create landing page for the store
 python scripts/create_landing_page.py
-# OR the store will auto-redirect to /shop/
+# OR the store will auto-redirect to /storefront/
 ```
 
 **Problem: No products showing in shop**