feat(knowledge): 移除知识库管理中的敏感级别功能

- 注释掉创建知识集表单中的敏感级别选择字段
- 移除知识集详情页面中的敏感级别显示项
- 注释掉相关的敏感级别选项配置常量
- 更新表单布局以保持一致的两列网格结构

frontend/src/pages/KnowledgeManagement/Detail/KnowledgeSetDetail.tsx

@@ -991,7 +991,7 @@ const KnowledgeSetDetail = () => {
           <Descriptions.Item label="领域">{knowledgeSet?.domain || "-"}</Descriptions.Item>
           <Descriptions.Item label="业务线">{knowledgeSet?.businessLine || "-"}</Descriptions.Item>
           <Descriptions.Item label="负责人">{knowledgeSet?.owner || "-"}</Descriptions.Item>
-          <Descriptions.Item label="敏感级别">{knowledgeSet?.sensitivity || "-"}</Descriptions.Item>
+          {/* <Descriptions.Item label="敏感级别">{knowledgeSet?.sensitivity || "-"}</Descriptions.Item> */}
           <Descriptions.Item label="有效期">
             {knowledgeSet?.validFrom || "-"} ~ {knowledgeSet?.validTo || "-"}
           </Descriptions.Item>

frontend/src/pages/KnowledgeManagement/components/CreateKnowledgeSet.tsx

@@ -9,6 +9,7 @@ import {
 import {
   knowledgeSourceTypeOptions,
   knowledgeStatusOptions,
+  // sensitivityOptions,
 } from "../knowledge-management.const";
 import {
   KnowledgeSet,
@@ -169,9 +170,9 @@ export default function CreateKnowledgeSet({
             <Form.Item label="负责人" name="owner">
               <Input placeholder="请输入负责人" />
             </Form.Item>
-            <Form.Item label="敏感级别" name="sensitivity">
-              <Input placeholder="请输入敏感级别" />
-            </Form.Item>
+            {/* <Form.Item label="敏感级别" name="sensitivity">
+              <Select options={sensitivityOptions} placeholder="请选择敏感级别" />
+            </Form.Item> */}
           </div>
           <div className="grid grid-cols-2 gap-4">
             <Form.Item label="有效期开始" name="validFrom">

frontend/src/pages/KnowledgeManagement/knowledge-management.const.tsx

@@ -66,6 +66,11 @@ export const knowledgeSourceTypeOptions = [
   { label: "文件上传", value: KnowledgeSourceType.FILE_UPLOAD },
 ];
 
+// export const sensitivityOptions = [
+//   { label: "敏感", value: "敏感" },
+//   { label: "不敏感", value: "不敏感" },
+// ];
+
 export type KnowledgeSetView = {
   id: string;
   name: string;