Add unit tests for models and services

- Implemented unit tests for Object model including folder and file creation, properties, and path retrieval.
- Added unit tests for Setting model covering creation, unique constraints, and type enumeration.
- Created unit tests for User model focusing on user creation, uniqueness, and group relationships.
- Developed unit tests for Login service to validate login functionality, including 2FA and token generation.
- Added utility tests for JWT creation and verification, ensuring token integrity and expiration handling.
- Implemented password utility tests for password generation, hashing, and TOTP verification.

models/__init__.py

@@ -15,7 +15,7 @@ from .user_authn import AuthnResponse, UserAuthn
 from .color import ThemeResponse
 
 from .download import Download
-from .group import Group, GroupBase, GroupOptionsBase, GroupResponse
+from .group import Group, GroupBase, GroupOptions, GroupOptionsBase, GroupResponse
 from .node import Node
 from .object import (
     DirectoryCreateRequest,
@@ -29,7 +29,7 @@ from .object import (
     PolicyResponse,
 )
 from .order import Order
-from .policy import Policy
+from .policy import Policy, PolicyType
 from .redeem import Redeem
 from .report import Report
 from .setting import Setting, SettingsType, SiteConfigResponse