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/model_base.py

@@ -0,0 +1,123 @@
+import uuid
+from datetime import datetime
+from enum import StrEnum
+
+from sqlmodel import Field
+
+from .base import SQLModelBase
+
+
+class ResponseBase(SQLModelBase):
+    """通用响应模型"""
+
+    instance_id: uuid.UUID = Field(default_factory=uuid.uuid4)
+    """实例ID，用于标识请求的唯一性"""
+
+
+# ==================== Admin Summary DTO ====================
+
+
+class MetricsSummary(SQLModelBase):
+    """站点统计摘要"""
+
+    dates: list[datetime]
+    """日期列表"""
+
+    files: list[int]
+    """每日新增文件数"""
+
+    users: list[int]
+    """每日新增用户数"""
+
+    shares: list[int]
+    """每日新增分享数"""
+
+    file_total: int
+    """文件总数"""
+
+    user_total: int
+    """用户总数"""
+
+    share_total: int
+    """分享总数"""
+
+    entities_total: int
+    """实体总数"""
+
+    generated_at: datetime
+    """生成时间"""
+
+
+class LicenseInfo(SQLModelBase):
+    """许可证信息"""
+
+    expired_at: datetime
+    """过期时间"""
+
+    signed_at: datetime
+    """签发时间"""
+
+    root_domains: list[str]
+    """根域名列表"""
+
+    domains: list[str]
+    """域名列表"""
+
+    vol_domains: list[str]
+    """卷域名列表"""
+
+
+class VersionInfo(SQLModelBase):
+    """版本信息"""
+
+    version: str
+    """版本号"""
+
+    pro: bool
+    """是否为专业版"""
+
+    commit: str
+    """提交哈希"""
+
+class AdminSummaryResponse(ResponseBase):
+    """管理员概况响应"""
+
+    metrics_summary: MetricsSummary
+    """统计摘要"""
+
+    site_urls: list[str]
+    """站点URL列表"""
+
+    license: LicenseInfo
+    """许可证信息"""
+
+    version: VersionInfo
+    """版本信息"""
+
+class MCPMethod(StrEnum):
+    """MCP 方法枚举"""
+
+    PING = "ping"
+    """Ping 方法，用于测试连接"""
+
+class MCPBase(SQLModelBase):
+    """MCP 请求基础模型"""
+    
+    jsonrpc: str = "2.0"
+    """JSON-RPC 版本"""
+
+    id: uuid.UUID = Field(default_factory=uuid.uuid4)
+    """请求/响应 ID，用于标识请求/响应的唯一性"""
+
+class MCPRequestBase(MCPBase):
+    """MCP 请求模型基础类"""
+
+    method: str
+    """方法名称"""
+
+class MCPResponseBase(MCPBase):
+    """MCP 响应模型基础类"""
+
+    result: str
+    """方法返回结果"""
+