fix: use static export for both CF Pages and Docker

- Set output: 'export' in next.config.ts (creates /out directory)
- Replaced Node.js standalone Dockerfile with nginx serving static files
- Updated docker-compose.yml for nginx (port 80)
- Both CF Pages and Docker now use the same static build

package.json

@@ -5,8 +5,6 @@
   "scripts": {
     "dev": "next dev",
     "build": "next build",
-    "build:static": "STATIC_EXPORT=true next build",
-    "pages:build": "STATIC_EXPORT=true npm run build",
     "start": "next start",
     "lint": "eslint",
     "test": "vitest run",