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>

app/templates/platform/base.html

@@ -7,7 +7,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
     {# Dynamic page title #}
-    <title>{% block title %}Wizamart - Order Management for Letzshop Sellers{% endblock %}</title>
+    <title>{% block title %}Orion - Order Management for Letzshop Sellers{% endblock %}</title>
 
     {# SEO Meta Tags #}
     <meta name="description" content="{% block meta_description %}Lightweight OMS for Letzshop stores in Luxembourg. Order management, inventory, and invoicing made simple.{% endblock %}">
@@ -64,7 +64,7 @@
                             <span class="text-white font-bold text-xl">W</span>
                         </div>
                         <span class="text-xl font-bold text-gray-900 dark:text-white">
-                            Wizamart
+                            Orion
                         </span>
                     </a>
                 </div>
@@ -190,7 +190,7 @@
                             <span class="text-white font-bold text-xl">W</span>
                         </div>
                         <span class="text-xl font-bold text-gray-900 dark:text-white">
-                            Wizamart
+                            Orion
                         </span>
                     </div>
                     <p class="text-gray-600 dark:text-gray-400 text-sm">
@@ -225,7 +225,7 @@
                             </a>
                         </li>
                         <li>
-                            <a href="/store/wizamart/login" class="text-gray-600 dark:text-gray-400 hover:text-primary transition-colors">
+                            <a href="/store/orion/login" class="text-gray-600 dark:text-gray-400 hover:text-primary transition-colors">
                                 {{ _("cms.platform.nav.store_login") }}
                             </a>
                         </li>