feat: 访问"概念中心"页面

2. 点击任意概念卡片进入概念详情
     3. 点击"历史时间轴"按钮（需要Max会员权限）
     4. 查看弹窗底部是否显示风险提示 & mock数据处理

src/views/Concept/ConceptTimelineModal.js

@@ -1,6 +1,7 @@
 import React, { useState, useEffect } from 'react';
 import { logger } from '../../utils/logger';
 import { useConceptTimelineEvents } from './hooks/useConceptTimelineEvents';
+import RiskDisclaimer from '../../components/RiskDisclaimer';
 import {
     Modal,
     ModalOverlay,
@@ -825,6 +826,11 @@ const ConceptTimelineModal = ({
                                 </VStack>
                             </Center>
                         )}
+
+                        {/* 风险提示 */}
+                        <Box px={6}>
+                            <RiskDisclaimer variant="default" />
+                        </Box>
                     </ModalBody>
 
                     <ModalFooter borderTop="1px solid" borderColor="gray.200">