chore: add unit test for router and implement command router

ref: N25B-205

src/control_backend/api/v1/endpoints/command.py

@@ -3,21 +3,18 @@ import logging
 
 from zmq import Socket
 
-from control_backend.schemas.message import Message
+from control_backend.schemas.ri_message import SpeechCommand, RIEndpoint
 
 logger = logging.getLogger(__name__)
 
 router = APIRouter()
 
-@router.post("/message", status_code=202)
-async def receive_message(message: Message, request: Request):
-    logger.info("Received message: %s", message.message)
-
-    topic = b"message"
-    body = message.model_dump_json().encode("utf-8")
-
+@router.post("/command", status_code=202)
+async def receive_command(command: SpeechCommand, request: Request):
+    # Validate and retrieve data.
+    SpeechCommand.model_validate(command)
+    topic = b"command"
     pub_socket: Socket = request.app.state.internal_comm_socket
+    pub_socket.send_multipart([topic, command])
 
-    pub_socket.send_multipart([topic, body])
-
-    return {"status": "Message received"}
+    return {"status": "Command received"}