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/storage_pack.py

@@ -0,0 +1,31 @@
+
+from typing import TYPE_CHECKING
+from datetime import datetime
+from uuid import UUID
+
+from sqlmodel import Field, Relationship, Column, func, DateTime
+
+from .base import SQLModelBase
+from .mixin import TableBaseMixin
+
+if TYPE_CHECKING:
+    from .user import User
+
+class StoragePack(SQLModelBase, TableBaseMixin):
+    """容量包模型"""
+
+    name: str = Field(max_length=255, description="容量包名称")
+    active_time: datetime | None = Field(default=None, description="激活时间")
+    expired_time: datetime | None = Field(default=None, index=True, description="过期时间")
+    size: int = Field(description="容量包大小（字节）")
+    
+    # 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="storage_packs")