🐳 Fix: Use env vars for serve binding

Dockerfile

@@ -22,10 +22,11 @@ RUN npm install -g serve
 # Expose port
 EXPOSE 3000
 
-# Environment
+# Environment - serve will bind to 0.0.0.0 automatically with these
 ENV NODE_ENV=production
 ENV PORT=3000
 ENV HOST=0.0.0.0
+ENV SERVE_LISTEN=0.0.0.0:3000
 
-# Start server - MUST bind to 0.0.0.0 for Docker
-CMD ["serve", "dist", "-l", "3000", "--config", "{\"public\":\"dist\",\"directoryListing\":false}"]
+# Start server - simple command, env vars handle binding
+CMD ["serve", "dist"]