新增社区页面路由，更新底部导航以移除占位符，优化音量控制按钮样式和功能

client/src/App.tsx

@@ -18,6 +18,7 @@ import IOPage from "./pages/IOPage";
 import VUPage from "./pages/VUPage";
 import SelectPage from "./pages/SelectPage";
 import AIPage from "./pages/AIPage";
+import CommunityPage from "./pages/CommunityPage";
 
 function AppRouter() {
   return (
@@ -35,6 +36,7 @@ function AppRouter() {
       <Route path="/vu" component={VUPage} />
       <Route path="/select" component={SelectPage} />
       <Route path="/ai" component={AIPage} />
+      <Route path="/community" component={CommunityPage} />
       <Route path="/404" component={NotFound} />
       <Route component={NotFound} />
     </Switch>