chore: checkpoint ai search comments and i18n foundation

frontend/src/components/FriendLinkCard.astro

@@ -1,4 +1,5 @@
 ---
+import { getI18n } from '../lib/i18n';
 import type { FriendLink } from '../lib/types';
 
 interface Props {
@@ -6,6 +7,7 @@ interface Props {
 }
 
 const { friend } = Astro.props;
+const { t } = getI18n(Astro);
 ---
 
 <a 
@@ -58,11 +60,11 @@ const { friend } = Astro.props;
           <span>{friend.category}</span>
         </span>
       ) : (
-        <span class="text-xs text-[var(--text-tertiary)] font-mono">external link</span>
+        <span class="text-xs text-[var(--text-tertiary)] font-mono">{t('friendCard.externalLink')}</span>
       )}
 
       <span class="terminal-link-arrow">
-        <span>访问</span>
+        <span>{t('common.visit')}</span>
         <i class="fas fa-arrow-up-right-from-square text-xs"></i>
       </span>
     </div>