feat: 添加 Action 协议

app/schemas/actions/update.py

@@ -0,0 +1,22 @@
+"""精确更新组件 props 或 style 下的一个字段"""
+
+from typing import Annotated, Literal
+
+from pydantic import Field, JsonValue
+
+from app.schemas.base import NonBlankString
+
+from .base import BaseAction
+
+PathSegment = NonBlankString | Annotated[int, Field(ge=0)]
+
+
+class UpdateAction(BaseAction):
+    type: Literal["update"] = "update"
+    section: Literal["props", "style"] = Field(description="允许更新的组件属性区域")
+    path: list[PathSegment] = Field(
+        min_length=1, description="区域内的字段路径，字符串为对象键，整数为数组下标"
+    )
+    value: JsonValue = Field(
+        description="替换该路径的值，支持任意 JSON；null 是赋值，不表示删除"
+    )