v4.0.6: output.css CDN 캐시 무효화 및 nginx CSS 캐시 정책 수정

HTML은 갱신됐으나 구 output.css가 CDN에 남아 Tailwind 레이아웃이 깨지던 문제를 ?v= 쿼리와 CSS must-revalidate로 해결한다.

Co-authored-by: Cursor <cursoragent@cursor.com>

login.html

@@ -3,7 +3,7 @@
     <head>
         <meta charset="UTF-8" />
         <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-        <link rel="stylesheet" href="./style/output.css" />
+        <link rel="stylesheet" href="./style/output.css?v=4.0.6" />
         <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;800;900&family=Noto+Sans+KR:wght@400;700;900&display=swap" rel="stylesheet" />
         <title>로그인 - UNIARE</title>
     </head>
@@ -41,7 +41,7 @@
             </p>
         </main>
 
-        <footer class="px-6 pb-5 text-center text-[0.625rem] font-medium tracking-wide text-slate-300" aria-hidden="true">v4.0.5</footer>
+        <footer class="px-6 pb-5 text-center text-[0.625rem] font-medium tracking-wide text-slate-300" aria-hidden="true">v4.0.6</footer>
 
         <script src="/script/page-i18n.js"></script>
         <script src="/script/api.js"></script>