fix(core,security): safe update extraction and async bulk vk actions

services/update_service.py

@@ -5,7 +5,42 @@ import urllib.error
 import urllib.request
 from urllib.parse import urlparse
 
-from PySide6.QtCore import QObject, Signal
+try:
+    from PySide6.QtCore import QObject, Signal
+except Exception:
+    class _FallbackBoundSignal:
+        def __init__(self):
+            self._callbacks = []
+
+        def connect(self, callback):
+            if callback is not None:
+                self._callbacks.append(callback)
+
+        def emit(self, *args, **kwargs):
+            for callback in list(self._callbacks):
+                callback(*args, **kwargs)
+
+    class _FallbackSignalDescriptor:
+        def __init__(self):
+            self._storage_name = ""
+
+        def __set_name__(self, owner, name):
+            self._storage_name = f"__fallback_signal_{name}"
+
+        def __get__(self, instance, owner):
+            if instance is None:
+                return self
+            signal = instance.__dict__.get(self._storage_name)
+            if signal is None:
+                signal = _FallbackBoundSignal()
+                instance.__dict__[self._storage_name] = signal
+            return signal
+
+    class QObject:
+        pass
+
+    def Signal(*_args, **_kwargs):
+        return _FallbackSignalDescriptor()
 
 
 def _version_key(version_text):