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/frontend/tailwind-css.md

@@ -21,7 +21,7 @@ Tailwind Standalone CLI (single binary, no npm)
     │
     ├── static/admin/css/tailwind.css     → tailwind.output.css (Admin)
     ├── static/store/css/tailwind.css    → tailwind.output.css (Store)
-    ├── static/shop/css/tailwind.css      → tailwind.output.css (Shop)
+    ├── static/storefront/css/tailwind.css      → tailwind.output.css (Shop)
     └── static/public/css/tailwind.css  → tailwind.output.css (Platform)
 ```