refactor(frontend): 重构RAG页面结构并收敛无效入口

frontend/src/layouts/AdminLayout.vue

@@ -2,18 +2,18 @@
 import {
   Box,
   Collection,
-  DataBoard,
   Document,
-  Files,
   Grid,
+  Histogram,
+  List,
 } from '@element-plus/icons-vue';
 
 const menuItems = [
-  { path: '/dashboard', label: '工作台', icon: DataBoard },
   { path: '/system/enums', label: '系统枚举', icon: Grid },
-  { path: '/system/attachments', label: '附件管理', icon: Files },
   { path: '/rag/stores', label: '知识库', icon: Collection },
+  { path: '/rag/workbench', label: 'RAG工作台', icon: Histogram },
   { path: '/rag/documents', label: '知识文档', icon: Document },
+  { path: '/rag/tasks/chunk', label: '切片任务', icon: List },
 ];
 </script>