Add domain field to shortlink API responses and sync script

app/api/shortlinks/[id]/route.ts

@@ -45,7 +45,8 @@ export async function GET(
         favorites,
         expires_at,
         click_count,
-        unique_visitors
+        unique_visitors,
+        domain
       FROM shorturl_analytics.shorturl
       WHERE id = '${id}' AND deleted_at IS NULL
       LIMIT 1
@@ -120,7 +121,7 @@ export async function GET(
       projects: projects,
       tags: tags.map((tag: any) => tag.tag_name || ''),
       createdAt: shortlink.created_at,
-      domain: new URL(shortUrl || 'https://example.com').hostname
+      domain: shortlink.domain || (shortUrl ? new URL(shortUrl).hostname : '')
     };
     
     const response: ApiResponse<typeof formattedShortlink> = {