feat: add home page and move card catalog

src/routes/+layout.svelte

@@ -4,9 +4,9 @@
 
 <header class="site-nav">
   <div class="nav-inner">
-    <a class="brand" href="/" aria-label="홀로도리 홈">홀로도리</a>
+    <a class="brand" href="/" aria-label="홀로도리 계산기 홈">홀로도리 계산기</a>
     <nav aria-label="주요 메뉴">
-      <a href="/" aria-current={$page.url.pathname === '/' ? 'page' : undefined}>카드 목록</a>
+      <a href="/cards" aria-current={$page.url.pathname.startsWith('/cards') ? 'page' : undefined}>카드 목록</a>
       <a href="/analysis" aria-current={$page.url.pathname.startsWith('/analysis') ? 'page' : undefined}>배치 분석</a>
       <a href="/combination" aria-current={$page.url.pathname.startsWith('/combination') ? 'page' : undefined}>조합 탐색</a>
       <a href="/data" aria-current={$page.url.pathname.startsWith('/data') ? 'page' : undefined}>사용자 데이터</a>