Prepare application for production use, including health check

Adds production deployment configurations, a health check endpoint, and fixes voice command confidence level.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ff0be73b-afdd-4747-978b-bb8301fb0a82
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/9777c70b-fc38-4831-8d6b-78dfffe041b0/43bdd979-982d-4330-b7ca-c1484048813c.jpg

client/src/hooks/useEnhancedVoice.tsx

@@ -37,7 +37,6 @@ export function useEnhancedVoice() {
   const { toast } = useToast();
   
   const recognitionRef = useRef<SpeechRecognition | null>(null);
-  const timeoutRef = useRef<NodeJS.Timeout | null>(null);
   const commandQueueRef = useRef<string[]>([]);
   
   const [settings, setSettings] = useState<VoiceSettings>({
@@ -107,7 +106,7 @@ export function useEnhancedVoice() {
         if (result.isFinal) {
           finalTranscript += transcript;
           if (alternative.confidence >= settings.confidenceThreshold) {
-            processVoiceCommand(transcript, result[0].confidence);
+            processVoiceCommand(transcript, alternative.confidence);
           }
         } else {
           interimTranscript += transcript;