refactor(menu): 调整菜单结构并更新数据管理标题

- 将数据管理菜单项标题从"数据管理"改为"数集管理"
- 重新排列菜单项顺序，将数据标注和内容生成功能移至数据管理后
- 数据集统计页面标题从"数据管理"更新为"数据集统计"
- 移除重复的数据标注和内容生成菜单配置项

frontend/src/pages/DataManagement/Home/DataManagement.tsx

@@ -329,7 +329,7 @@ export default function DatasetManagementPage() {
     <div className="gap-4 h-full flex flex-col">
       {/* Header */}
       <div className="flex items-center justify-between">
-        <h1 className="text-xl font-bold">数据管理</h1>
+        <h1 className="text-xl font-bold">数据集统计</h1>
         <div className="flex gap-2 items-center">
           {/* tasks */}
           <TagManager

frontend/src/pages/Layout/menu.tsx

@@ -24,11 +24,25 @@ export const menuItems = [
   // },
   {
     id: "management",
-    title: "数据管理",
+    title: "数集管理",
     icon: FolderOpen,
     description: "创建、导入和管理数据集",
     color: "bg-blue-500",
   },
+  {
+    id: "annotation",
+    title: "数据标注",
+    icon: Tag,
+    description: "对数据进行标注和标记",
+    color: "bg-green-500",
+  },
+  {
+    id: "content-generation",
+    title: "内容生成",
+    icon: Sparkles,
+    description: "智能内容生成与创作",
+    color: "bg-purple-500",
+  },
   {
     id: "knowledge-management",
     title: "知识管理",
@@ -43,20 +57,6 @@ export const menuItems = [
   //   description: "数据清洗和预处理",
   //   color: "bg-purple-500",
   // },
-  {
-    id: "annotation",
-    title: "数据标注",
-    icon: Tag,
-    description: "对数据进行标注和标记",
-    color: "bg-green-500",
-  },
-  {
-    id: "content-generation",
-    title: "内容生成",
-    icon: Sparkles,
-    description: "智能内容生成与创作",
-    color: "bg-purple-500",
-  },
   // {
   //   id: "synthesis",
   //   title: "数据合成",