修改了nanobot，往Hermes agent的风格走，进度1/3

app-instance/backend/beaver/services/team_service.py

@@ -0,0 +1,10 @@
+"""Application service for coordinated team runs."""
+
+
+class TeamService:
+    """Placeholder service for multi-agent execution."""
+
+    def run(self, task: str) -> str:
+        """Return a placeholder summary until real backends are migrated."""
+        return f"team run placeholder: {task}"
+