Remove token revocation logic and unused dependencies

Eliminated the `RevokedToken` model and associated logic for managing token revocation. Removed unused files, related tests, and outdated dependencies in authentication modules. Simplified token decoding, user validation, and dependency injection by streamlining the flow and enhancing maintainability.

backend/app/models/__init__.py

@@ -29,7 +29,6 @@ from .gift import (
 from .email_template import EmailTemplate, TemplateType
 from .notification_log import NotificationLog, NotificationType, NotificationStatus
 from .activity_log import ActivityLog, ActivityType
-from .token import RevokedToken
 # Make sure all models are imported above this line
 __all__ = [
     'Base', 'TimestampMixin', 'UUIDMixin',
@@ -40,5 +39,4 @@ __all__ = [
     'EmailTemplate', 'TemplateType',
     'NotificationLog', 'NotificationType', 'NotificationStatus',
     'ActivityLog', 'ActivityType',
-    'RevokedToken',
 ]