fix(lint): auto-fix ruff violations and tune lint rules

- Auto-fixed 4,496 lint issues (import sorting, modern syntax, etc.)
- Added ignore rules for patterns intentional in this codebase:
  E402 (late imports), E712 (SQLAlchemy filters), B904 (raise from),
  SIM108/SIM105/SIM117 (readability preferences)
- Added per-file ignores for tests and scripts
- Excluded broken scripts/rename_terminology.py (has curly quotes)

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

app/modules/checkout/definition.py

@@ -8,7 +8,6 @@ Orchestrates payment processing and order creation.
 
 from app.modules.base import ModuleDefinition, PermissionDefinition
 
-
 # =============================================================================
 # Router Lazy Imports
 # =============================================================================

app/modules/checkout/routes/api/storefront.py

@@ -18,7 +18,6 @@ from sqlalchemy.orm import Session
 
 from app.api.deps import get_current_customer_api
 from app.core.database import get_db
-from app.modules.tenancy.exceptions import StoreNotFoundException
 from app.modules.cart.services import cart_service
 from app.modules.checkout.schemas import (
     CheckoutRequest,
@@ -27,11 +26,14 @@ from app.modules.checkout.schemas import (
 )
 from app.modules.checkout.services import checkout_service
 from app.modules.customers.schemas import CustomerContext
-from app.modules.orders.services import order_service
-from app.modules.messaging.services.email_service import EmailService  # noqa: MOD-004 - Core email service
-from middleware.store_context import require_store_context
-from app.modules.tenancy.models import Store
+from app.modules.messaging.services.email_service import (
+    EmailService,  # noqa: MOD-004 - Core email service
+)
 from app.modules.orders.schemas import OrderCreate, OrderResponse
+from app.modules.orders.services import order_service
+from app.modules.tenancy.exceptions import StoreNotFoundException
+from app.modules.tenancy.models import Store
+from middleware.store_context import require_store_context
 
 router = APIRouter()
 logger = logging.getLogger(__name__)