fix(frontend): 修复 manualChunks 循环依赖导致生产白屏

仅拆分 codemirror/xterm/icons 独立库，避免 vendor-charts 与 vendor-react 循环引用。

backend/static/index.html

@@ -7,8 +7,10 @@
     <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
     <meta name="theme-color" content="#1e6feb" />
     <title>AIOps智能运维平台</title>
-    <script type="module" crossorigin src="/assets/index-BTQygws6.js"></script>
-    <link rel="stylesheet" crossorigin href="/assets/index-gdjfqXlA.css">
+    <script type="module" crossorigin src="/assets/index-BZzvNKfa.js"></script>
+    <link rel="modulepreload" crossorigin href="/assets/vendor-codemirror-C7mXSpXt.js">
+    <link rel="modulepreload" crossorigin href="/assets/vendor-icons-DIDdqO_o.js">
+    <link rel="stylesheet" crossorigin href="/assets/index-7YeEJX-w.css">
   </head>
   <body>
     <div id="root"></div>