feat: started ping router and internal messaging for pings

ref: N25B-151

test/integration/api/endpoints/test_robot_endpoint.py

@@ -3,7 +3,7 @@ from fastapi import FastAPI
 from fastapi.testclient import TestClient
 from unittest.mock import MagicMock
 
-from control_backend.api.v1.endpoints import command
+from control_backend.api.v1.endpoints import robot
 from control_backend.schemas.ri_message import SpeechCommand
 
 
@@ -14,7 +14,7 @@ def app():
     Also sets up a mock internal_comm_socket.
     """
     app = FastAPI()
-    app.include_router(command.router)
+    app.include_router(robot.router)
     app.state.internal_comm_socket = MagicMock()  # mock ZMQ socket
     return app