fix: correct the gestures bugs, change gestures socket to request/reply

ref: N25B-334

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

@@ -66,23 +66,19 @@ async def get_available_gesture_tags(request: Request):
     :param request: The FastAPI request object.
     :return: A list of available gesture tags.
     """
-    sub_socket = Context.instance().socket(zmq.SUB)
-    sub_socket.connect(settings.zmq_settings.internal_sub_address)
-    sub_socket.setsockopt(zmq.SUBSCRIBE, b"get_gestures")
-
-    pub_socket: Socket = request.app.state.endpoints_pub_socket
-    topic = b"send_gestures"
+    req_socket = Context.instance().socket(zmq.REQ)
+    req_socket.connect("tcp://localhost:7788")
 
     # TODO: Implement a way to get a certain ammount from the UI, rather than everything.
     amount = None
     timeout = 5  # seconds
 
-    await pub_socket.send_multipart([topic, amount.to_bytes(4, "big") if amount else b""])
+    await req_socket.send(f"{amount}".encode() if amount else b"None")
     try:
-        _, body = await asyncio.wait_for(sub_socket.recv_multipart(), timeout=timeout)
+        body = await asyncio.wait_for(req_socket.recv(), timeout=timeout)
     except TimeoutError:
-        body = b"tags: []"
-        logger.debug("got timeout error fetching gestures")
+        body = '{"tags": []}'
+        logger.debug("Got timeout error fetching gestures.")
 
     # Handle empty response and JSON decode errors
     available_tags = []