feat(website): Add llms.txt support

Author: yamadashy

website/client/.vitepress/config/configShard.ts

@@ -1,6 +1,7 @@
 import { visualizer } from 'rollup-plugin-visualizer';
 import { type ManifestOptions, VitePWA } from 'vite-plugin-pwa';
 import { defineConfig } from 'vitepress';
+import llmstxt from 'vitepress-plugin-llms';
 import { configDeSearch } from './configDe';
 import { configEsSearch } from './configEs';
 import { configJaSearch } from './configJa';
@@ -137,6 +138,7 @@ export const configShard = defineConfig({
       },
     },
     plugins: [
+      llmstxt(),
       VitePWA({
         registerType: 'autoUpdate',
         manifest,