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>

.architecture-rules/module.yaml

@@ -154,16 +154,16 @@ module_rules:
     severity: "warning"
     description: |
       Self-contained modules should have an exceptions.py file defining
-      module-specific exceptions that inherit from WizamartException.
+      module-specific exceptions that inherit from OrionException.
 
       Structure:
         app/modules/{module}/exceptions.py
 
       Example:
         # app/modules/analytics/exceptions.py
-        from app.exceptions import WizamartException
+        from app.exceptions import OrionException
 
-        class AnalyticsException(WizamartException):
+        class AnalyticsException(OrionException):
             """Base exception for analytics module."""
             pass