Removed unnecessary libraries

Author: PayalLakra

app.py

@@ -8,7 +8,7 @@
 import os
 import json
 from threading import Thread
-from flask import Response, stream_with_context
+from flask import Response
 
 app = Flask(__name__)
 app.secret_key = 'your_secret_key_here'

npg-ble.py

@@ -4,10 +4,7 @@
 from pylsl import StreamInfo, StreamOutlet
 import sys
 import argparse
-import os
-import signal
 import threading
-from typing import Optional
 
 # BLE parameters (must match your firmware)
 DEVICE_NAME_PREFIX = "NPG"