fix(nav): 修复问答梳理等带子路径页面的导航高亮丢失问题

KnowledgeBasePage 加载后自动跳转至 /knowledge/:noteId，原精确路径匹配
导致顶栏和侧边栏选中态丢失。将 hasActiveChild / isItemActive /
menuItemContainsPath 等 8 处判断统一改为前缀匹配
（pathname === path || pathname.startsWith(path + "/")），
覆盖浅色侧边栏、深色侧边栏、顶部导航栏三套组件。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend-web/src/pages/StrategyRoutes.tsx

@@ -25,6 +25,7 @@ import ChatPage from "./ChatPage";
 import ChatsPage from "./ChatsPage";
 import AdminUserLeaderboardPage from "./AdminUserLeaderboardPage";
 import AdminUserLeaderboardSettingsPage from "./AdminUserLeaderboardSettingsPage";
+import PublicLeaderboardPage from "./PublicLeaderboardPage";
 import LightAppIframeView from "./LightAppIframeView";
 import LightAppListPage from "./LightAppListPage";
 import LightAppManagementPage from "./LightAppManagementPage";
@@ -253,6 +254,7 @@ export default function StrategyRoutes() {
                 )
               }
             />
+            <Route path="user-leaderboard" element={<PublicLeaderboardPage />} />
             <Route
               path="admin/user-leaderboard"
               element={