feat: Implement MFA authentication, add ride statistics model, and update various services, APIs, and tests across the application.

backend/apps/accounts/selectors.py

@@ -3,11 +3,12 @@ Selectors for user and account-related data retrieval.
 Following Django styleguide pattern for separating data access from business logic.
 """
 
-from typing import Dict, Any
-from django.db.models import QuerySet, Q, F, Count
-from django.contrib.auth import get_user_model
-from django.utils import timezone
 from datetime import timedelta
+from typing import Any
+
+from django.contrib.auth import get_user_model
+from django.db.models import Count, F, Q, QuerySet
+from django.utils import timezone
 
 User = get_user_model()
 
@@ -196,7 +197,7 @@ def users_with_social_accounts() -> QuerySet:
     )
 
 
-def user_statistics_summary() -> Dict[str, Any]:
+def user_statistics_summary() -> dict[str, Any]:
     """
     Get overall user statistics for dashboard/analytics.