fix(loyalty): fix runtime bugs in storefront routes, point expiration, and enforce settings

- Add total_points_voided column to LoyaltyCard with migration (loyalty_002)
- Fix storefront self_enroll to use correct service method signature and schema fields
- Fix get_my_card/get_my_transactions to use get_card_by_customer_and_merchant
- Fix transaction history field reference (balance_after -> points_balance_after)
- Fix point_expiration task: wrong field names and manual balance update -> card.expire_points()
- Register storefront_router in definition.py and export all routers from __init__.py
- Enforce MerchantLoyaltySettings in storefront enrollment, points, and stamp void operations
- Fix test fixture using non-existent balance_after column
- Suppress intentional architecture validator warnings in templates

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/loyalty/routes/api/__init__.py

@@ -5,7 +5,13 @@ Loyalty module API routes.
 Provides REST API endpoints for:
 - Admin: Platform-wide loyalty program management
 - Store: Store loyalty operations (stamps, points, cards)
-- Public: Customer enrollment and wallet passes
+- Platform: Platform administration
+- Storefront: Customer enrollment and wallet passes
 """
 
-__all__: list[str] = []
+from app.modules.loyalty.routes.api.admin import admin_router
+from app.modules.loyalty.routes.api.store import store_router
+from app.modules.loyalty.routes.api.platform import platform_router
+from app.modules.loyalty.routes.api.storefront import storefront_router
+
+__all__ = ["admin_router", "store_router", "platform_router", "storefront_router"]