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/use-toast-CkA38LVP.js

@@ -0,0 +1 @@
+import{r as i}from"./vendor-codemirror-C7mXSpXt.js";function d(){const[r,s]=i.useState([]),c=i.useCallback(o=>{const t=Math.random().toString(36).slice(2),e={id:t,...o};s(a=>[...a,e]),setTimeout(()=>{s(a=>a.filter(u=>u.id!==t))},4e3)},[]),n=i.useCallback(o=>{s(t=>t.filter(e=>e.id!==o))},[]);return{toast:c,toasts:r,dismiss:n}}export{d as u};