feat：节点合并

app/schemas/screen_design.py

@@ -0,0 +1,12 @@
+"""规划与动作一次生成的输出协议，供 DesignNode 使用"""
+
+from pydantic import Field
+
+from app.schemas.actions import ActionBatch
+from app.schemas.base import ExtensibleModel
+from app.schemas.screen_plan import ScreenPlan
+
+
+class ScreenDesign(ExtensibleModel):
+    plan: ScreenPlan = Field(description="本次设计方案，校验动作范围的依据")
+    batch: ActionBatch = Field(description="落实 plan 的动作，与 plan 的组件逐一对应")