feat(整合): 新增更新时间轴浏览页面与顶部快捷入口

- 创建 src/data/changelog.json 数据文件
- 添加 ChangelogType 和 ChangelogEntry 类型定义
- 实现更新时间轴页面组件，支持按时间倒序展示
- 添加 /changelog 主路由和 /updates 别名路由
- 在顶部导航右侧添加 History 图标入口，支持激活态高亮
- 使用 Framer Motion 实现渐进式动画效果
- 支持深色模式和响应式布局

via [HAPI](https://hapi.run)

Co-Authored-By: HAPI <noreply@hapi.run>

src/App.tsx

@@ -1,4 +1,4 @@
-import { Routes, Route } from 'react-router-dom'
+import { Routes, Route, Navigate } from 'react-router-dom'
 import { Layout } from './components/layout/Layout'
 import { HomePage } from './pages/HomePage'
 import { KnowledgeAreasPage } from './pages/KnowledgeAreasPage'
@@ -8,6 +8,7 @@ import { ProcessMatrixPage } from './pages/ProcessMatrixPage'
 import { ProcessGraphPage } from './pages/ProcessGraphPage'
 import { ArtifactDetailPage } from './pages/ArtifactDetailPage'
 import { ToolDetailPage } from './pages/ToolDetailPage'
+import { ChangelogPage } from './pages/ChangelogPage'
 import { SettingsPage } from './pages/SettingsPage'
 import ProcessPracticePage from './pages/ProcessPracticePage'
 
@@ -26,6 +27,8 @@ function App() {
         <Route path="/process-practice" element={<ProcessPracticePage />} />
         <Route path="/artifact/:id" element={<ArtifactDetailPage />} />
         <Route path="/tool/:id" element={<ToolDetailPage />} />
+        <Route path="/changelog" element={<ChangelogPage />} />
+        <Route path="/updates" element={<Navigate to="/changelog" replace />} />
         <Route path="/settings" element={<SettingsPage />} />
       </Routes>
     </Layout>