feat(audiobook): implement audiobook project management features

qwen3-tts-frontend/src/App.tsx

@@ -16,6 +16,7 @@ const Home = lazy(() => import('@/pages/Home'))
 const Settings = lazy(() => import('@/pages/Settings'))
 const UserManagement = lazy(() => import('@/pages/UserManagement'))
 const VoiceManagement = lazy(() => import('@/pages/VoiceManagement'))
+const Audiobook = lazy(() => import('@/pages/Audiobook'))
 
 function ProtectedRoute({ children }: { children: React.ReactNode }) {
   const { isAuthenticated, isLoading } = useAuth()
@@ -109,6 +110,14 @@ function App() {
                     </ProtectedRoute>
                   }
                 />
+                <Route
+                  path="/audiobook"
+                  element={
+                    <ProtectedRoute>
+                      <Audiobook />
+                    </ProtectedRoute>
+                  }
+                />
               </Routes>
             </Suspense>
             </UserPreferencesProvider>