Add trailing slashes to node URLs and update comment

Appended trailing slashes to all node URLs in nodes.json for consistency. Also updated a comment in run.py for clarity.

Author: Pymmdrza

app/config/nodes.json

@@ -1,8 +1,8 @@
 {
   "nodes": [
-    "https://bitcoin.atomicwallet.io/api/v2",
-    "https://btcbook.guarda.co/api/v2",
-    "https://btc1.trezor.io/api/v2"
+    "https://bitcoin.atomicwallet.io/api/v2/",
+    "https://btcbook.guarda.co/api/v2/",
+    "https://btc1.trezor.io/api/v2/"
   ],
   "query": {
     "address": "address/",

run.py

@@ -17,7 +17,7 @@ async def start_websocket():
     asyncio.run(start_websocket())
 
 if __name__ == '__main__':
-    # Start WebSocket connection in a separate thread
+    # Start a WebSocket connection in a separate thread
     websocket_thread = threading.Thread(target=run_websocket, daemon=True)
     websocket_thread.start()