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/redeem.py

@@ -0,0 +1,23 @@
+from enum import StrEnum
+
+from sqlmodel import Field, text
+
+from .base import SQLModelBase
+from .mixin import TableBaseMixin
+
+
+class RedeemType(StrEnum):
+    """兑换码类型枚举"""
+    # [TODO] 补充具体兑换码类型
+    pass
+
+
+class Redeem(SQLModelBase, TableBaseMixin):
+    """兑换码模型"""
+
+    type: int = Field(default=0, sa_column_kwargs={"server_default": "0"})
+    """兑换码类型 [TODO] 待定义枚举"""
+    product_id: int | None = Field(default=None, description="关联的商品/权益ID")
+    num: int = Field(default=1, sa_column_kwargs={"server_default": "1"}, description="可兑换数量/时长等")
+    code: str = Field(unique=True, index=True, description="兑换码，唯一")
+    used: bool = Field(default=False, sa_column_kwargs={"server_default": text("false")}, description="是否已使用")