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/assets/index-CYARH0Cq.js

@@ -0,0 +1 @@
+import{r as u}from"./vendor-codemirror-C7mXSpXt.js";function o(r){const e=u.useRef({value:r,previous:r});return u.useMemo(()=>(e.current.value!==r&&(e.current.previous=e.current.value,e.current.value=r),e.current.previous),[r])}export{o as u};