feat(menu): 移除知识库功能入口和Webhook配置

- 从菜单中移除知识生成相关的BookOpen图标
- 删除知识库功能的导航项及其相关配置
- 移除Webhook配置页面和对应的菜单选项
- 简化设置页面的导入依赖和组件结构

frontend/src/pages/Layout/menu.tsx

@@ -2,7 +2,6 @@ import {
   FolderOpen,
   Tag,
   Target,
-  BookOpen,
   Shuffle,
   BarChart3,
   MessageSquare,
@@ -70,13 +69,6 @@ export const menuItems = [
     description: "质量分析、性能评估和偏见检测",
     color: "bg-indigo-500",
   },
-  {
-    id: "knowledge-base",
-    title: "知识生成",
-    icon: BookOpen,
-    description: "面向RAG的知识库构建",
-    color: "bg-teal-500",
-  },
   {
     id: "operator-market",
     title: "算子市场",