Add Docker deployment setup with health check endpoint

- Add multi-stage Dockerfile with standalone Next.js output
- Add docker-compose.yml with Caddy reverse proxy
- Add nginx configs for local and SSL setups
- Add Caddyfile for automatic HTTPS
- Add docker-entrypoint.sh for runtime config
- Add .env.example and .dockerignore
- Add comprehensive Docker README
- Add /api/health endpoint for container health checks
- Configure next.config.ts for standalone output

next.config.ts

@@ -1,7 +1,11 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
-  // Empty turbopack config to silence the warning
+  // Enable standalone output for Docker deployment
+  // This creates a minimal server.js that doesn't require full node_modules
+  output: 'standalone',
+  
+  // Turbopack configuration
   turbopack: {},
 };