Update Astro configuration to use Node adapter and adjust server settings

- Replaced Fastify adapter with Node for standalone mode.
- Maintained the inclusion of the @astrojs/prefetch integration for resource loading optimization.

astro.config.ts

@@ -12,7 +12,7 @@ import icon from 'astro-icon';
 import compress from 'astro-compress';
 import type { AstroIntegration } from 'astro';
 import astrowind from './vendor/integration';
-import fastify from '@astrojs/fastify';
+import node from '@astrojs/node';
 import prefetch from '@astrojs/prefetch';
 
 import { readingTimeRemarkPlugin, responsiveTablesRehypePlugin, lazyImagesRehypePlugin } from './src/utils/frontmatter';
@@ -25,7 +25,7 @@ const whenExternalScripts = (items: (() => AstroIntegration) | (() => AstroInteg
 
 export default defineConfig({
   output: 'server',
-  adapter: fastify(),
+  adapter: node({ mode: 'standalone' }),
   
   server: {
     port: 3000,