Adds Kubernetes sandbox provisioner support (#35)

* Adds Kubernetes sandbox provisioner support

* Improves Docker dev setup by standardizing host paths

Replaces hardcoded host paths with a configurable root directory,
making the development environment more portable and easier to use
across different machines. Automatically sets the root path if not
already defined, reducing manual setup steps.

backend/src/agents/lead_agent/agent.py

@@ -237,12 +237,8 @@ def _build_middlewares(config: RunnableConfig):
 
 def make_lead_agent(config: RunnableConfig):
     # Lazy import to avoid circular dependency
-    import logging
-
     from src.tools import get_available_tools
 
-    logging.basicConfig(level=logging.INFO)
-
     thinking_enabled = config.get("configurable", {}).get("thinking_enabled", True)
     model_name = config.get("configurable", {}).get("model_name") or config.get("configurable", {}).get("model")
     is_plan_mode = config.get("configurable", {}).get("is_plan_mode", False)

backend/src/agents/middlewares/thread_data_middleware.py

@@ -7,9 +7,7 @@ from langchain.agents.middleware import AgentMiddleware
 from langgraph.runtime import Runtime
 
 from src.agents.thread_state import ThreadDataState
-
-# Base directory for thread data (relative to backend/)
-THREAD_DATA_BASE_DIR = ".deer-flow/threads"
+from src.sandbox.consts import THREAD_DATA_BASE_DIR
 
 
 class ThreadDataMiddlewareState(AgentState):