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/backend/middleware-reference.md

@@ -92,7 +92,7 @@ Centralized class for detecting which frontend a request targets based on URL pa
 2. Path-based detection:
    - `/admin/*`, `/api/v1/admin/*` → ADMIN
    - `/store/*`, `/api/v1/store/*` → STORE
-   - `/storefront/*`, `/shop/*`, `/stores/*` → STOREFRONT
+   - `/storefront/*`, `/stores/*` → STOREFRONT
    - `/api/v1/platform/*` → PLATFORM
 3. Store subdomain → STOREFRONT
 4. Store context set → STOREFRONT
@@ -210,17 +210,17 @@ Middleware for request/response logging and performance monitoring.
 
 **Modern Approach: Double Router Mounting**
 
-Instead of using middleware to rewrite paths, the application registers shop routes **twice** with different prefixes:
+Instead of using middleware to rewrite paths, the application registers storefront routes **twice** with different prefixes:
 
 ```python
 # In main.py
-app.include_router(shop_pages.router, prefix="/shop")
-app.include_router(shop_pages.router, prefix="/stores/{store_code}/shop")
+app.include_router(storefront_pages.router, prefix="/storefront")
+app.include_router(storefront_pages.router, prefix="/stores/{store_code}/storefront")
 ```
 
 **How It Works:**
-- **Subdomain/Custom Domain Mode**: Routes match `/shop/*` prefix
-- **Path-Based Development Mode**: Routes match `/stores/{store_code}/shop/*` prefix
+- **Subdomain/Custom Domain Mode**: Routes match `/storefront/*` prefix
+- **Path-Based Development Mode**: Routes match `/stores/{store_code}/storefront/*` prefix
 - FastAPI handles routing naturally without path manipulation
 - Store code is available as a path parameter when needed