Make ws4kp being exposed optional

Dockerfile

@@ -63,8 +63,8 @@ RUN npm install -g yarn && yarn install --frozen-lockfile || yarn install
 COPY index.js ./
 COPY src/ ./src/
 
-# Expose both ports
-EXPOSE 3000 8080
+# Expose streaming app port (WS4KP port only exposed when explicitly configured)
+EXPOSE 3000
 
 # Start both services using JSON array format
 CMD ["/bin/sh", "-c", "cd /app && node index.js & cd /streaming-app && yarn start"]