enh: Make builtin search web tools asynchronous (open-webui#20630)

Co-authored-by: Tim Baek <tim@openwebui.com>
Co-authored-by: joaoback <156559121+joaoback@users.noreply.github.com>

Author: 3 people

backend/open_webui/tools/builtin.py

@@ -166,7 +166,7 @@ async def search_web(
         engine = __request__.app.state.config.WEB_SEARCH_ENGINE
         user = UserModel(**__user__) if __user__ else None
 
-        results = _search_web(__request__, engine, query, user)
+        results = await asyncio.to_thread(_search_web, __request__, engine, query, user)
 
         # Limit results
         results = results[:count] if results else []