refactor: rename Wizamart to Orion across entire codebase

Replace all ~1,086 occurrences of Wizamart/wizamart/WIZAMART/WizaMart
with Orion/orion/ORION across 184 files. This includes database
identifiers, email addresses, domain references, R2 bucket names,
DNS prefixes, encryption salt, Celery app name, config defaults,
Docker configs, CI configs, documentation, seed data, and templates.

Renames homepage-wizamart.html template to homepage-orion.html.
Fixes duplicate file_pattern key in api.yaml architecture rule.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/api/storefront-api-reference.md

@@ -24,17 +24,17 @@ The Storefront API provides customer-facing endpoints for browsing products, man
 
 All Storefront API endpoints automatically receive store context from the `StoreContextMiddleware`:
 
-1. **Browser makes API call** from storefront page (e.g., `/stores/wizamart/storefront/products`)
-2. **Browser automatically sends Referer header**: `http://localhost:8000/stores/wizamart/storefront/products`
+1. **Browser makes API call** from storefront page (e.g., `/stores/orion/storefront/products`)
+2. **Browser automatically sends Referer header**: `http://localhost:8000/stores/orion/storefront/products`
 3. **Middleware extracts store** from Referer path/subdomain/domain
-4. **Middleware sets** `request.state.store = <Store: wizamart>`
+4. **Middleware sets** `request.state.store = <Store: orion>`
 5. **API endpoint accesses store**: `store = request.state.store`
 6. **No store_id needed in URL!**
 
 ### Supported Store Detection Methods
 
-- **Path-based**: `/stores/wizamart/storefront/products` → extracts `wizamart`
-- **Subdomain**: `wizamart.platform.com` → extracts `wizamart`
+- **Path-based**: `/stores/orion/storefront/products` → extracts `orion`
+- **Subdomain**: `orion.platform.com` → extracts `orion`
 - **Custom domain**: `customshop.com` → looks up store by domain
 
 ---
@@ -92,7 +92,7 @@ Get paginated list of products for current store.
 
 ```http
 GET /api/v1/storefront/products?skip=0&limit=20&is_featured=true
-Referer: http://localhost:8000/stores/wizamart/shop/products
+Referer: http://localhost:8000/stores/orion/shop/products
 ```
 
 **Response (200 OK):**
@@ -142,7 +142,7 @@ Get detailed information for a specific product.
 
 ```http
 GET /api/v1/storefront/products/1
-Referer: http://localhost:8000/stores/wizamart/shop/products
+Referer: http://localhost:8000/stores/orion/shop/products
 ```
 
 **Response (200 OK):**
@@ -200,7 +200,7 @@ Retrieve cart contents for a session.
 
 ```http
 GET /api/v1/storefront/cart/session-abc-123
-Referer: http://localhost:8000/stores/wizamart/shop/cart
+Referer: http://localhost:8000/stores/orion/shop/cart
 ```
 
 **Response (200 OK):**