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.

sqlmodels/user_authn.py

@@ -0,0 +1,61 @@
+from typing import TYPE_CHECKING
+from uuid import UUID
+
+from sqlalchemy import Column, Text
+from sqlmodel import Field, Relationship
+
+from .base import SQLModelBase
+from .mixin import TableBaseMixin
+
+if TYPE_CHECKING:
+    from .user import User
+
+
+# ==================== DTO 模型 ====================
+
+class AuthnResponse(SQLModelBase):
+    """WebAuthn 响应 DTO"""
+
+    id: str
+    """凭证ID"""
+
+    fingerprint: str
+    """凭证指纹"""
+
+
+# ==================== 数据库模型 ====================
+
+class UserAuthn(SQLModelBase, TableBaseMixin):
+    """用户 WebAuthn 凭证模型，与 User 为多对一关系"""
+
+    credential_id: str = Field(max_length=255, unique=True, index=True)
+    """凭证 ID，Base64 编码"""
+
+    credential_public_key: str = Field(sa_column=Column(Text))
+    """凭证公钥，Base64 编码"""
+
+    sign_count: int = Field(default=0, ge=0)
+    """签名计数器，用于防重放攻击"""
+
+    credential_device_type: str = Field(max_length=32)
+    """凭证设备类型：'single_device' 或 'multi_device'"""
+
+    credential_backed_up: bool = Field(default=False)
+    """凭证是否已备份"""
+
+    transports: str | None = Field(default=None, max_length=255)
+    """支持的传输方式，逗号分隔，如 'usb,nfc,ble,internal'"""
+
+    name: str | None = Field(default=None, max_length=100)
+    """用户自定义的凭证名称，便于识别"""
+
+    # 外键
+    user_id: UUID = Field(
+        foreign_key="user.id",
+        index=True,
+        ondelete="CASCADE"
+    )
+    """所属用户UUID"""
+
+    # 关系
+    user: "User" = Relationship(back_populates="authns")