Fix webhook response handling and update server port to 8502

app.py

@@ -73,7 +73,6 @@ class SMSWebhookHandler(BaseHTTPRequestHandler):
             self.wfile.write(
                 b"<?xml version='1.0'?><Response><Message>Got it!</Message></Response>"
             )
-            st.rerun()
 
         except Exception as e:
             logging.error(f"Webhook error: {e}")
@@ -85,7 +84,7 @@ class SMSWebhookHandler(BaseHTTPRequestHandler):
 # --- Run webhook server in background ---
 def run_webhook_server():
     try:
-        server = HTTPServer(("", 8080), SMSWebhookHandler)
+        server = HTTPServer(("", 8502), SMSWebhookHandler)
         logging.info("Webhook server started on port 8080")
         server.serve_forever()
     except Exception as e: