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/billing/tests/unit/test_admin_subscription_service.py

@@ -22,7 +22,6 @@ from app.modules.billing.services.admin_subscription_service import (
 )
 from app.modules.tenancy.models import Merchant
 
-
 # ============================================================================
 # Tier Management
 # ============================================================================

app/modules/billing/tests/unit/test_billing_service.py

@@ -6,6 +6,13 @@ from unittest.mock import MagicMock, patch
 
 import pytest
 
+from app.modules.billing.models import (
+    AddOnProduct,
+    BillingHistory,
+    MerchantSubscription,
+    SubscriptionStatus,
+    SubscriptionTier,
+)
 from app.modules.billing.services.billing_service import (
     BillingService,
     NoActiveSubscriptionError,
@@ -14,15 +21,6 @@ from app.modules.billing.services.billing_service import (
     SubscriptionNotCancelledError,
     TierNotFoundError,
 )
-from app.modules.billing.models import (
-    AddOnProduct,
-    BillingHistory,
-    MerchantSubscription,
-    SubscriptionStatus,
-    SubscriptionTier,
-    StoreAddOn,
-)
-
 
 # ============================================================================
 # Tier Lookup

app/modules/billing/tests/unit/test_capacity_forecast_service.py

@@ -11,16 +11,15 @@ Tests cover:
 
 from datetime import UTC, datetime, timedelta
 from decimal import Decimal
-from unittest.mock import MagicMock, patch
 
 import pytest
 
+from app.modules.billing.models import CapacitySnapshot
 from app.modules.billing.services.capacity_forecast_service import (
     INFRASTRUCTURE_SCALING,
     CapacityForecastService,
     capacity_forecast_service,
 )
-from app.modules.billing.models import CapacitySnapshot
 
 
 @pytest.mark.unit

app/modules/billing/tests/unit/test_stripe_webhook_handler.py

@@ -1,14 +1,13 @@
 # tests/unit/services/test_stripe_webhook_handler.py
 """Unit tests for StripeWebhookHandler."""
 
-from datetime import datetime, timezone
-from unittest.mock import MagicMock, patch
+from datetime import UTC, datetime
+from unittest.mock import MagicMock
 
 import pytest
 
 from app.handlers.stripe_webhook import StripeWebhookHandler
 from app.modules.billing.models import (
-    BillingHistory,
     MerchantSubscription,
     StripeWebhookEvent,
     SubscriptionStatus,
@@ -175,8 +174,8 @@ def test_subscription(db, test_store):
         store_id=test_store.id,
         tier="essential",
         status=SubscriptionStatus.TRIAL,
-        period_start=datetime.now(timezone.utc),
-        period_end=datetime.now(timezone.utc),
+        period_start=datetime.now(UTC),
+        period_end=datetime.now(UTC),
     )
     db.add(subscription)
     db.commit()
@@ -207,8 +206,8 @@ def test_active_subscription(db, test_store):
         status=SubscriptionStatus.ACTIVE,
         stripe_customer_id="cus_test123",
         stripe_subscription_id="sub_test123",
-        period_start=datetime.now(timezone.utc),
-        period_end=datetime.now(timezone.utc),
+        period_start=datetime.now(UTC),
+        period_end=datetime.now(UTC),
     )
     db.add(subscription)
     db.commit()
@@ -248,8 +247,8 @@ def mock_subscription_updated_event():
     event.data.object.id = "sub_test123"
     event.data.object.customer = "cus_test123"
     event.data.object.status = "active"
-    event.data.object.current_period_start = int(datetime.now(timezone.utc).timestamp())
-    event.data.object.current_period_end = int(datetime.now(timezone.utc).timestamp())
+    event.data.object.current_period_start = int(datetime.now(UTC).timestamp())
+    event.data.object.current_period_end = int(datetime.now(UTC).timestamp())
     event.data.object.cancel_at_period_end = False
     event.data.object.items.data = []
     event.data.object.metadata = {}
@@ -277,7 +276,7 @@ def mock_invoice_paid_event():
     event.data.object.customer = "cus_test123"
     event.data.object.payment_intent = "pi_test123"
     event.data.object.number = "INV-001"
-    event.data.object.created = int(datetime.now(timezone.utc).timestamp())
+    event.data.object.created = int(datetime.now(UTC).timestamp())
     event.data.object.subtotal = 4900
     event.data.object.tax = 0
     event.data.object.total = 4900

app/modules/billing/tests/unit/test_subscription_service.py

@@ -10,11 +10,9 @@ from app.modules.billing.models import (
     MerchantSubscription,
     SubscriptionStatus,
     SubscriptionTier,
-    TierCode,
 )
 from app.modules.billing.services.subscription_service import SubscriptionService
 
-
 # ============================================================================
 # Tier Information
 # ============================================================================