Fix build: externalize elysia packages, use standalone output, fix NODE_ENV

- Add serverExternalPackages for @elysiajs/static and elysia to prevent
  webpack from bundling dynamic imports that cause Html prerender error
- Use output: standalone for proper Docker deployment
- Comment out NODE_ENV=development in .env.example to avoid conflict
  with next build which requires NODE_ENV=production
- Set NODE_ENV=production before build step in Dockerfile
- Update runtime stage to use standalone output structure

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

next.config.ts

@@ -1,6 +1,8 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
+  output: 'standalone',
+  serverExternalPackages: ['@elysiajs/static', 'elysia'],
   experimental: {},
   allowedDevOrigins: [
     "http://192.168.1.82:3000", // buat akses dari HP/device lain