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/rbac-visual-guide.md

@@ -335,5 +335,5 @@ Customer → Store Portal               Customer → Own Account
 Cookie Isolation:
 admin_token (path=/admin)   ← Only sent to /admin/*
 store_token (path=/store) ← Only sent to /store/*
-customer_token (path=/shop) ← Only sent to /shop/*
+customer_token (path=/storefront) ← Only sent to /storefront/*
 ```