feat: frontend overhaul - health panel + sparklines + auto-refresh

- Add health status panel with component status dots
- Add auto-refresh toggle with configurable interval (3s/6s/10s/30s)
- Add performance sparkline bars (TPS/CPU/Memory/Players)
- Use useReducer for terminal lines (append/clear)
- Better responsive layout for mobile
- Third ambient background layer for visual depth
- Refined glass-panel hover effects

src/main/resources/static/index.html

@@ -5,8 +5,8 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Aluer Nebula Console</title>
     <meta name="theme-color" content="#07111f" />
-    <script type="module" crossorigin src="/nebula-assets/index-BCClgI-o.js"></script>
-    <link rel="stylesheet" crossorigin href="/nebula-assets/index-zE5mL-wO.css">
+    <script type="module" crossorigin src="/nebula-assets/index-Dy6U3sfe.js"></script>
+    <link rel="stylesheet" crossorigin href="/nebula-assets/index-U0uziwCJ.css">
   </head>
   <body>
     <div id="root">