fix: implement forced exit on shutdown and enhance shutdown handling

src/core/utils/general/shutdown.py

@@ -1,9 +1,10 @@
 import threading
-from core.network.libtorrent_misc import cleanup_session
-from core.utils.general.wrappers import run_thread
+import os
 
 shutdown_event = threading.Event()
 
 def closehelper():
-    run_thread(threading.Thread(target=cleanup_session))
-    shutdown_event.set()
+    shutdown_event.set()
+
+def force_exit():
+    os._exit(0)