refactor: update Elysia initialization with API prefix and fix API destination in Next.js config

feat: add targetId for Pixiv and Twitter uploads in post routes
style: adjust filter container margin and button styles for improved layout

apps/frontend/next.config.ts

@@ -7,7 +7,7 @@ const nextConfig: NextConfig = {
     return [
       {
         source: '/api/:path*',
-        destination: `${process.env.API_BASE_URL}/:path*`,
+        destination: `${process.env.API_BASE_URL}/api/:path*`,
       },
     ];
   },