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/implementation/messaging-system.md

@@ -145,9 +145,9 @@ The attachment size limit is configurable via platform settings:
 - **Default:** 10
 - **Category:** messaging
 
-## Shop (Customer) Interface
+## Storefront (Customer) Interface
 
-### API Endpoints (`/api/v1/shop/messages`)
+### API Endpoints (`/api/v1/storefront/messages`)
 
 | Endpoint | Method | Description |
 |----------|--------|-------------|
@@ -160,8 +160,8 @@ The attachment size limit is configurable via platform settings:
 
 ### Frontend
 
-- **Template:** `app/templates/shop/account/messages.html`
-- **Page Route:** `/shop/account/messages` and `/shop/account/messages/{conversation_id}`
+- **Template:** `app/templates/storefront/account/messages.html`
+- **Page Route:** `/storefront/account/messages` and `/storefront/account/messages/{conversation_id}`
 
 Features:
 - Conversation list with unread badges
@@ -236,7 +236,7 @@ Messages is available under "Platform Administration" section.
 ### Store Sidebar
 Messages is available under "Sales" section.
 
-### Shop Account Dashboard
+### Storefront Account Dashboard
 Messages card is available on the customer account dashboard with unread count badge.
 
 ### Header Badge