fix: Use serve for production hosting

- Added 'serve' package for static file hosting
- Updated Dockerfile to use 'serve' instead of astro preview
- serve has no host restrictions
- Fixes Easypanel access issue

package.json

@@ -14,6 +14,7 @@
     "astro": "^5.17.1",
     "astro-consent": "^1.0.17",
     "drizzle-orm": "^0.45.1",
+    "serve": "^14.2.4",
     "tailwindcss": "^4.2.1"
   }
 }