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/implementation/platform-marketing-homepage.md

@@ -2,7 +2,7 @@
 
 ## Overview
 
-The Wizamart marketing homepage serves as the main public entry point for Letzshop stores looking to use the order management platform. It provides a complete self-service signup flow with Stripe payment integration.
+The Orion marketing homepage serves as the main public entry point for Letzshop stores looking to use the order management platform. It provides a complete self-service signup flow with Stripe payment integration.
 
 **Target Audience:** Letzshop stores in Luxembourg seeking order management solutions.
 
@@ -53,7 +53,7 @@ Based on `docs/marketing/pricing.md`:
 
 ### 1. Marketing Homepage (`/`)
 
-**Template:** `app/templates/public/homepage-wizamart.html`
+**Template:** `app/templates/public/homepage-orion.html`
 
 **Sections:**
 
@@ -352,8 +352,8 @@ app/
 │   └── stripe_service.py            # SetupIntent methods (updated)
 └── templates/
     └── platform/
-        ├── base.html                # Base template (Wizamart branding)
-        ├── homepage-wizamart.html   # Marketing homepage
+        ├── base.html                # Base template (Orion branding)
+        ├── homepage-orion.html   # Marketing homepage
         ├── pricing.html             # Pricing page
         ├── find-shop.html           # Letzshop finder
         ├── signup.html              # Signup wizard