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/exception.yaml

@@ -44,17 +44,17 @@ exception_rules:
         - "exc_info=True"
 
   - id: "EXC-004"
-    name: "Domain exceptions must inherit from WizamartException"
+    name: "Domain exceptions must inherit from OrionException"
     severity: "error"
     description: |
-      All custom domain exceptions must inherit from WizamartException (or its
+      All custom domain exceptions must inherit from OrionException (or its
       subclasses like ResourceNotFoundException, ValidationException, etc.).
       This ensures the global exception handler catches and converts them properly.
     pattern:
       file_pattern:
         - "app/exceptions/**/*.py"
         - "app/modules/*/exceptions.py"
-      required_base_class: "WizamartException"
+      required_base_class: "OrionException"
       example_good: |
         class VendorNotFoundException(ResourceNotFoundException):
             def __init__(self, vendor_code: str):
@@ -65,7 +65,7 @@ exception_rules:
     severity: "error"
     description: |
       The global exception handler must be set up in app initialization to
-      catch WizamartException and convert to HTTP responses.
+      catch OrionException and convert to HTTP responses.
     pattern:
       file_pattern: "app/main.py"
       required_patterns: