Remove dormant wake attempt on Tor foreground restart

Arti's dormant/wake FFI functions are no-op stubs that don't actually
implement dormant mode. The app was wasting 2.5-12 seconds trying to
wake from a dormant state that doesn't exist before falling back to
a full restart.

This change:
- Removes wakeFromDormant() call and function
- Simplifies goDormantOnBackground() to just mark state as not ready
- Goes straight to restartArti() on foreground, eliminating the delay

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

bitchat/ViewModels/Extensions/ChatViewModel+Tor.swift

@@ -24,7 +24,7 @@ extension ChatViewModel {
             }
         }
     }
-    
+
     @objc func handleTorWillRestart() {
         Task { @MainActor in
             self.torRestartPending = true