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/status.html

@@ -4,7 +4,7 @@
 <meta charset="utf-8">
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <title>Статус · {{.Agent.Name}} - LPRA</title>
-<link rel="stylesheet" href="/static/app.css">
+<link rel="stylesheet" href="{{asset "app.css"}}">
 <style>
   .meters { display:grid; grid-template-columns:repeat(auto-fit, minmax(240px, 1fr)); gap:20px; margin-bottom:20px; }
   .meters .card { margin:0; }