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/marketplace/services/onboarding_service.py

@@ -14,7 +14,6 @@ from datetime import UTC, datetime
 
 from sqlalchemy.orm import Session
 
-from app.modules.tenancy.exceptions import StoreNotFoundException
 from app.modules.marketplace.exceptions import (
     OnboardingCsvUrlRequiredException,
     OnboardingNotFoundException,
@@ -22,15 +21,16 @@ from app.modules.marketplace.exceptions import (
     OnboardingSyncJobNotFoundException,
     OnboardingSyncNotCompleteException,
 )
-from app.modules.marketplace.services.letzshop import (
-    LetzshopCredentialsService,
-    LetzshopOrderService,
-)
 from app.modules.marketplace.models import (
     OnboardingStatus,
     OnboardingStep,
     StoreOnboarding,
 )
+from app.modules.marketplace.services.letzshop import (
+    LetzshopCredentialsService,
+    LetzshopOrderService,
+)
+from app.modules.tenancy.exceptions import StoreNotFoundException
 from app.modules.tenancy.models import Store
 
 logger = logging.getLogger(__name__)
@@ -295,14 +295,13 @@ class OnboardingService:
                 "store_id": None,
                 "shop_slug": shop_slug,
             }
-        else:
-            return {
-                "success": False,
-                "message": error or "Connection failed",
-                "store_name": None,
-                "store_id": None,
-                "shop_slug": None,
-            }
+        return {
+            "success": False,
+            "message": error or "Connection failed",
+            "store_name": None,
+            "store_id": None,
+            "shop_slug": None,
+        }
 
     def complete_letzshop_api(
         self,