fix: add standalone output for Docker deployment

Required for Next.js standalone build in Docker container.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

next.config.mjs

@@ -1,12 +1,12 @@
 /** @type {import('next').NextConfig} */
 const nextConfig = {
+  output: 'standalone',
   typescript: {
     ignoreBuildErrors: true,
   },
   images: {
     unoptimized: true,
   },
- 
 }
 
 export default nextConfig