首页新增 what‘s new 入口，维护一个 changelog 文档

client/src/App.tsx

@@ -16,6 +16,7 @@ import IOPage from "./pages/IOPage";
 import VUPage from "./pages/VUPage";
 import SelectPage from "./pages/SelectPage";
 import CommunityPage from "./pages/CommunityPage";
+import ChangelogPage from "./pages/ChangelogPage";
 import { AIDrawerProvider } from "./contexts/AIDrawerContext";
 import DesktopAIShell from "./components/DesktopAIShell";
 import { appShellColumnClass, appShellOuterClass } from "./lib/appShell";
@@ -66,6 +67,7 @@ function AppRouter() {
       <Route path="/select" component={SelectPage} />
       <Route path="/ai" component={AIPageRoute} />
       <Route path="/community" component={CommunityPage} />
+      <Route path="/changelog" component={ChangelogPage} />
       <Route path="/404" component={NotFound} />
       <Route component={NotFound} />
     </Switch>