feat: redesign metadata as KV store, add custom properties and WOPI Discovery

Replace one-to-one FileMetadata table with flexible ObjectMetadata KV pairs,
add custom property definitions, WOPI Discovery auto-configuration, and
per-extension action URL support.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

sqlmodels/custom_property.py

@@ -0,0 +1,135 @@
+"""
+用户自定义属性定义模型
+
+允许用户定义类型化的自定义属性模板（如标签、评分、分类等），
+实际值通过 ObjectMetadata KV 表存储，键名格式：custom:{property_definition_id}。
+
+支持的属性类型：text, number, boolean, select, multi_select, rating, link
+"""
+from enum import StrEnum
+from typing import TYPE_CHECKING
+from uuid import UUID
+
+from sqlalchemy import JSON
+from sqlmodel import Field, Relationship
+
+from sqlmodel_ext import SQLModelBase, UUIDTableBaseMixin
+
+if TYPE_CHECKING:
+    from .user import User
+
+
+# ==================== 枚举 ====================
+
+class CustomPropertyType(StrEnum):
+    """自定义属性值类型枚举"""
+    TEXT = "text"
+    """文本"""
+    NUMBER = "number"
+    """数字"""
+    BOOLEAN = "boolean"
+    """布尔值"""
+    SELECT = "select"
+    """单选"""
+    MULTI_SELECT = "multi_select"
+    """多选"""
+    RATING = "rating"
+    """评分（1-5）"""
+    LINK = "link"
+    """链接"""
+
+
+# ==================== Base 模型 ====================
+
+class CustomPropertyDefinitionBase(SQLModelBase):
+    """自定义属性定义基础模型"""
+
+    name: str = Field(max_length=100)
+    """属性显示名称"""
+
+    type: CustomPropertyType
+    """属性值类型"""
+
+    icon: str | None = Field(default=None, max_length=100)
+    """图标标识（iconify 名称）"""
+
+    options: list[str] | None = Field(default=None, sa_type=JSON)
+    """可选值列表（仅 select/multi_select 类型）"""
+
+    default_value: str | None = Field(default=None, max_length=500)
+    """默认值"""
+
+
+# ==================== 数据库模型 ====================
+
+class CustomPropertyDefinition(CustomPropertyDefinitionBase, UUIDTableBaseMixin):
+    """
+    用户自定义属性定义
+
+    每个用户独立管理自己的属性模板。
+    实际属性值存储在 ObjectMetadata 表中，键名格式：custom:{id}。
+    """
+
+    owner_id: UUID = Field(
+        foreign_key="user.id",
+        ondelete="CASCADE",
+        index=True,
+    )
+    """所有者用户UUID"""
+
+    sort_order: int = 0
+    """排序顺序"""
+
+    # 关系
+    owner: "User" = Relationship()
+    """所有者"""
+
+
+# ==================== DTO 模型 ====================
+
+class CustomPropertyCreateRequest(SQLModelBase):
+    """创建自定义属性请求 DTO"""
+
+    name: str = Field(max_length=100)
+    """属性显示名称"""
+
+    type: CustomPropertyType
+    """属性值类型"""
+
+    icon: str | None = None
+    """图标标识"""
+
+    options: list[str] | None = None
+    """可选值列表（仅 select/multi_select 类型）"""
+
+    default_value: str | None = None
+    """默认值"""
+
+
+class CustomPropertyUpdateRequest(SQLModelBase):
+    """更新自定义属性请求 DTO"""
+
+    name: str | None = None
+    """属性显示名称"""
+
+    icon: str | None = None
+    """图标标识"""
+
+    options: list[str] | None = None
+    """可选值列表"""
+
+    default_value: str | None = None
+    """默认值"""
+
+    sort_order: int | None = None
+    """排序顺序"""
+
+
+class CustomPropertyResponse(CustomPropertyDefinitionBase):
+    """自定义属性响应 DTO"""
+
+    id: UUID
+    """属性定义UUID"""
+
+    sort_order: int
+    """排序顺序"""