Phase 0: Fix ModuleEnableSettings list() - use get() instead of get_or_create

- Changed to use get() with DoesNotExist exception handling
- Creates settings only if they don't exist
- Better error handling with traceback
- Fixes 404 'Setting not found' errors

backend/igny8_core/modules/system/settings_views.py

@@ -327,8 +327,8 @@ class ModuleEnableSettingsViewSet(AccountModelViewSet):
             account = getattr(request, 'account', None)
             if not account:
                 user = getattr(request, 'user', None)
-                if user:
-                    account = getattr(user, 'account', None)
+                if user and hasattr(user, 'account'):
+                    account = user.account
             
             if not account:
                 return error_response(
@@ -337,11 +337,18 @@ class ModuleEnableSettingsViewSet(AccountModelViewSet):
                     request=request
                 )
             
-            # Get or create settings for account
-            settings, created = ModuleEnableSettings.objects.get_or_create(account=account)
+            # Get or create settings for account (one per account)
+            try:
+                settings = ModuleEnableSettings.objects.get(account=account)
+            except ModuleEnableSettings.DoesNotExist:
+                # Create default settings for account
+                settings = ModuleEnableSettings.objects.create(account=account)
+            
             serializer = self.get_serializer(settings)
             return success_response(data=serializer.data, request=request)
         except Exception as e:
+            import traceback
+            error_trace = traceback.format_exc()
             return error_response(
                 error=f'Failed to load module enable settings: {str(e)}',
                 status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,