feat：完成大部分数据文件上传解析功能

app/agent/tools.py

@@ -3,7 +3,7 @@
 它们读写的是本次请求的大屏和 agent 状态，所以放在本地；物料等能力由 MCP 提供
 """
 
-from dataclasses import dataclass
+from dataclasses import dataclass, field
 from typing import Annotated, NotRequired
 
 from langchain.agents import AgentState
@@ -13,6 +13,7 @@ from langgraph.types import Command
 from pydantic import Field
 
 from app.actions.batch import BatchError, run_batch
+from app.agent.data_tools import DataContext
 from app.schemas.actions import Action, AddAction, AgentAction
 from app.schemas.component_resource import ComponentCatalog
 from app.schemas.screen import Screen
@@ -22,6 +23,7 @@ from app.schemas.screen import Screen
 class ScreenAgentContext:
     screen: Screen  # 本次请求的原始大屏，只读
     catalog: ComponentCatalog  # 当前物料目录，只用于补全和校验
+    data: DataContext = field(default_factory=DataContext)  # 本会话可用的数据表
 
 
 def _latest(_, new):