refactor：重构导入路径以简化wait_for_frontend_tool_result的位置

Author: Rasic2

agents/matmaster_agent/flow_agents/agent.py

@@ -5,6 +5,7 @@
 from asyncio import CancelledError
 from typing import AsyncGenerator
 
+from app.tools import wait_for_frontend_tool_result
 from google.adk.agents import InvocationContext, LlmAgent
 from google.adk.events import Event
 from opik.integrations.adk import track_adk_agent_recursive
@@ -122,9 +123,6 @@
     PLAN,
     UPLOAD_FILE,
 )
-from agents.matmaster_agent.sub_agents.built_in_agent.demo_frontend_agent import (
-    wait_for_frontend_tool_result,
-)
 from agents.matmaster_agent.sub_agents.mapping import (
     AGENT_CLASS_MAPPING,
     ALL_AGENT_TOOLS_LIST,