Add sync_default_tools function to manage system-provided tools

- Introduce a new `sync_default_tools` function in `session.py` to ensure essential reusable tools are created without overwriting existing edits.
- Update the `lifespan` context manager in `app.py` to call `sync_default_tools`, enhancing the initialization process for the application.
- This change improves the management of default tools within the system, ensuring they are available for use while preserving user modifications.

backend/app.py

@@ -16,7 +16,7 @@ from contextlib import asynccontextmanager
 
 import settings
 import uvicorn
-from db.session import sync_interface_definitions
+from db.session import sync_default_tools, sync_interface_definitions
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
@@ -36,6 +36,7 @@ from routes import (
 @asynccontextmanager
 async def lifespan(_app: FastAPI):
     await sync_interface_definitions()
+    await sync_default_tools()
     yield