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/architecture/overview.md

@@ -49,8 +49,8 @@ admin.platform.com → Admin Interface
 
 #### Path-Based Mode (Development Only)
 ```
-platform.com/stores/store1/shop → Store 1 Shop
-platform.com/stores/store2/shop → Store 2 Shop
+platform.com/storefront/store1 → Store 1 Shop
+platform.com/storefront/store2 → Store 2 Shop
 platform.com/admin                → Admin Interface
 ```
 
@@ -124,7 +124,7 @@ graph TB
     F -->|API /api/*| G[API Router]
     F -->|Admin /admin/*| H[Admin Page Router]
     F -->|Store /store/*| I[Store Page Router]
-    F -->|Shop /shop/*| J[Shop Page Router]
+    F -->|Shop /storefront/*| J[Shop Page Router]
 
     G --> K[JSON Response]
     H --> L[Admin HTML]
@@ -163,7 +163,7 @@ graph TB
 
 **Access**: Store users (owners and team members)
 
-### Shop Interface (`/shop/*` or custom domains)
+### Shop Interface (`/storefront/*` or custom domains)
 
 **Purpose**: Customer-facing storefront