feat: add models for physical files, policies, and user management

- Implement PhysicalFile model to manage physical file references and reference counting.
- Create Policy model with associated options and group links for storage policies.
- Introduce Redeem and Report models for handling redeem codes and reports.
- Add Settings model for site configuration and user settings management.
- Develop Share model for sharing objects with unique codes and associated metadata.
- Implement SourceLink model for managing download links associated with objects.
- Create StoragePack model for managing user storage packages.
- Add Tag model for user-defined tags with manual and automatic types.
- Implement Task model for managing background tasks with status tracking.
- Develop User model with comprehensive user management features including authentication.
- Introduce UserAuthn model for managing WebAuthn credentials.
- Create WebDAV model for managing WebDAV accounts associated with users.

tests/fixtures/objects.py

@@ -7,8 +7,8 @@ from uuid import UUID
 
 from sqlmodel.ext.asyncio.session import AsyncSession
 
-from models.object import Object, ObjectType
-from models.user import User
+from sqlmodels.object import Object, ObjectType
+from sqlmodels.user import User
 
 
 class ObjectFactory:
@@ -119,7 +119,7 @@ class ObjectFactory:
             Object: 创建的根目录实例
         """
         root = Object(
-            name=user.username,
+            name="/",
             type=ObjectType.FOLDER,
             parent_id=None,
             owner_id=user.id,