fix: static files linked with their content hash, so a release is never shadowed by a cached copy (Cloudflare kept the old CSS)

internal/server/web/templates/settings.html

@@ -4,7 +4,7 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Настройки - LPRA</title>
-<link rel="stylesheet" href="/static/app.css">
+<link rel="stylesheet" href="{{asset "app.css"}}">
 </head>
 <body>
 <header class="topbar">