Add Super Admin login routing and wire tenant onboarding to auto-create a location

super_admin is now a real LoginRole, derived from the server's
issuperadmin flag (not a client-guessable roleid) — routes exclusively
to a new minimal SuperAdminPage, never the merchant console.

That page reuses the existing tenant/store/rider onboarding wizard
(AdminConsole) rather than duplicating it — its Tenant tab was already
calling the right composite endpoint but had nowhere to send location
data, and was never actually reachable from anywhere in the app. Now
it collects a primary outlet name + business category and sends a
nested tenantlocations object, so one submit provisions tenant +
active location + admin user instead of leaving the tenant
locationless. createTenantUser also moves off the mob API base onto
the web one, matching where this is actually called from.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/App.tsx

@@ -54,6 +54,7 @@ import StoreDetailView from './components/StoreDetailView';
 import DispatchHubView from './components/DispatchHubView';
 import LoginView from './components/LoginView';
 import UserStorePage from './components/UserStorePage';
+import SuperAdminPage from './components/SuperAdminPage';
 import AwaitingApi from './components/AwaitingApi';
 import ComparisonModal from './components/ComparisonModal';
 import CatalogueBrowser from './components/CatalogueBrowser';
@@ -568,6 +569,17 @@ export default function App() {
     );
   }
 
+  // Platform operator, not scoped to any tenant — never sees the merchant
+  // console (dashboard/inventory/catalogue/etc), only tenant onboarding.
+  if (authRole === 'super_admin' && authUser) {
+    return (
+      <Routes>
+        <Route path="/superadmin/*" element={<SuperAdminPage onLogout={handleLogout} user={authUser} />} />
+        <Route path="*" element={<Navigate to="/superadmin/onboarding" replace />} />
+      </Routes>
+    );
+  }
+
   const AdminConsole = (
     <div className="min-h-screen bg-[#f8fafc] text-[#0f172a] font-sans antialiased overflow-x-hidden">
       {/* Navbar segment */}