feat: add leader rating song recommendations

src/routes/+layout.svelte

@@ -32,6 +32,7 @@
     <nav aria-label="주요 메뉴">
       <a href="/cards" aria-current={$page.url.pathname.startsWith('/cards') ? 'page' : undefined}>카드 목록</a>
       <a href="/analysis" aria-current={$page.url.pathname.startsWith('/analysis') ? 'page' : undefined}>배치 분석</a>
+      <a href="/rating" aria-current={$page.url.pathname.startsWith('/rating') ? 'page' : undefined}>리더 레이팅</a>
       <a href="/combination" aria-current={$page.url.pathname.startsWith('/combination') ? 'page' : undefined}>조합 탐색</a>
       {#if showEventTab}<a href="/event" aria-current={$page.url.pathname.startsWith('/event') ? 'page' : undefined}>이벤트 Pt</a>{/if}
       <a href="/data" aria-current={$page.url.pathname.startsWith('/data') ? 'page' : undefined}>사용자 데이터</a>