feat: 添加 Action 协议

app/schemas/actions/__init__.py

@@ -0,0 +1,24 @@
+"""动作类型统一入口，新增操作时在这里显式加入联合类型"""
+
+from typing import Annotated
+
+from pydantic import Field, TypeAdapter
+
+from .base import ActionModel, BaseAction
+from .move import MoveAction
+from .resize import ResizeAction
+from .update import UpdateAction
+
+# 按 type 选择对应模型，不维护重复的操作名称映射
+Action = Annotated[MoveAction | ResizeAction | UpdateAction, Field(discriminator="type")]
+action_adapter = TypeAdapter(Action)
+
+
+class ActionBatch(ActionModel):
+    actions: list[Action] = Field(description="按数组顺序执行的动作列表，允许为空")
+
+
+__all__ = [
+    "Action", "ActionBatch", "BaseAction", "MoveAction", "ResizeAction",
+    "UpdateAction", "action_adapter",
+]