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>

tests/unit/services/test_admin_notification_service.py

@@ -15,8 +15,6 @@ from app.modules.messaging.services.admin_notification_service import (
     Priority,
     Severity,
 )
-from app.modules.messaging.models import AdminNotification
-from app.modules.tenancy.models import PlatformAlert
 
 
 @pytest.fixture
@@ -260,7 +258,7 @@ class TestAdminNotificationServiceQuery:
 
     def test_get_notifications_filter_read(self, db, notification_service, test_admin):
         """Test filtering by read status."""
-        n1 = notification_service.create_notification(
+        notification_service.create_notification(
             db=db,
             notification_type=NotificationType.SYSTEM_ALERT,
             title="Unread",
@@ -602,13 +600,13 @@ class TestPlatformAlertServiceQuery:
     def test_get_statistics(self, db, alert_service, test_admin):
         """Test getting alert statistics."""
         # Create some alerts
-        alert1 = alert_service.create_alert(
+        alert_service.create_alert(
             db=db,
             alert_type=AlertType.SYSTEM,
             severity=Severity.WARNING,
             title="Active Warning",
         )
-        alert2 = alert_service.create_alert(
+        alert_service.create_alert(
             db=db,
             alert_type=AlertType.SECURITY,
             severity=Severity.CRITICAL,