v1.8.81: fix update apply — os._exit(0) to kill daemon threads

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

gui/app.py

@@ -347,8 +347,7 @@ class App(ctk.CTk):
 
         if event_type == "auto_apply":
             # Full-auto mode: apply immediately
-            if self.updater.apply_update(path):
-                self.destroy()
+            self._apply_update(path)
             return
 
         # Show banner
@@ -399,9 +398,19 @@ class App(ctk.CTk):
         )
 
     def _apply_update(self, path: str):
-        """Apply downloaded update."""
+        """Apply downloaded update — cleanup, launch updater script, force exit."""
+        import os, sys
         if self.updater.apply_update(path):
-            self.destroy()
+            # Full cleanup before exit
+            try:
+                self.session_pool.disconnect_all()
+                self.checker.stop()
+                self.updater.stop()
+                self.destroy()
+            except Exception:
+                pass
+            # Force terminate — daemon threads keep process alive otherwise
+            os._exit(0)
 
     def _skip_update(self, version: str):
         """Skip this version."""