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/features/store-landing-pages.md

@@ -11,13 +11,13 @@ Each store can have a custom landing page at their root URL with different desig
 ```
 Root Landing Page:
 - Custom Domain:   https://customdomain.com/           → Landing Page
-- Subdomain:       https://wizamart.platform.com/      → Landing Page
-- Path-based:      http://localhost:8000/stores/wizamart/ → Landing Page
+- Subdomain:       https://orion.platform.com/      → Landing Page
+- Path-based:      http://localhost:8000/stores/orion/ → Landing Page
 
 E-commerce Shop:
 - Custom Domain:   https://customdomain.com/shop/      → Shop Homepage
-- Subdomain:       https://wizamart.platform.com/shop/ → Shop Homepage
-- Path-based:      http://localhost:8000/stores/wizamart/shop/ → Shop Homepage
+- Subdomain:       https://orion.platform.com/shop/ → Shop Homepage
+- Path-based:      http://localhost:8000/stores/orion/shop/ → Shop Homepage
 ```
 
 ## Features
@@ -170,13 +170,13 @@ ADD COLUMN template VARCHAR(50) NOT NULL DEFAULT 'default';
 ### Get Landing Page
 ```http
 GET /api/v1/shop/content-pages/landing
-Referer: https://wizamart.platform.com/
+Referer: https://orion.platform.com/
 
 Response:
 {
   "id": 1,
   "slug": "landing",
-  "title": "Welcome to WizaMart",
+  "title": "Welcome to Orion",
   "content": "<p>...</p>",
   "template": "modern",
   "is_published": true
@@ -188,8 +188,8 @@ Response:
 ### Test Landing Page
 1. Create a landing page via database or admin panel
 2. Access store root URL:
-   - Path-based: `http://localhost:8000/stores/wizamart/`
-   - Subdomain: `https://wizamart.platform.com/`
+   - Path-based: `http://localhost:8000/stores/orion/`
+   - Subdomain: `https://orion.platform.com/`
 3. Should see your custom landing page
 
 ### Test Fallback