fix: add missing objects routes to SystemRoutes for top-level /system/objects navigation

The ObjectManagerPage routes only existed in AppContent (for /apps/:appName/system/objects)
but not in the SystemRoutes component (for /system/objects). This meant clicking on objects
in the list triggered navigate('/system/objects/:objectName') correctly, but the route
wasn't handled, so the detail page never rendered.

Agent-Logs-Url: https://github.com/objectstack-ai/objectui/sessions/80a817a2-deca-4fe3-9ca5-17d26519d734

Co-authored-by: hotlong <50353452+hotlong@users.noreply.github.com>

Author: Copilot

apps/console/src/App.tsx

@@ -506,6 +506,8 @@ function SystemRoutes() {
       <Routes>
         <Route path="/" element={<SystemHubPage />} />
         <Route path="apps" element={<AppManagementPage />} />
+        <Route path="objects" element={<ObjectManagerPage />} />
+        <Route path="objects/:objectName" element={<ObjectManagerPage />} />
         <Route path="users" element={<UserManagementPage />} />
         <Route path="organizations" element={<OrgManagementPage />} />
         <Route path="roles" element={<RoleManagementPage />} />