feat(h5-auth): restore partner and shop WeChat login

Re-enable one-tap WeChat login, post-SMS OAuth bind, and quick login gates so partner/shop openId flows work again on staging.

apps/h5-shop/src/components/AuthGate.tsx

@@ -1,4 +1,5 @@
 import { Navigate, useLocation } from 'react-router-dom';
+import { getStoreProfile, hasShopWxSession } from '../lib/api';
 import { useStoreSession } from '../contexts/StoreSessionContext';
 
 const PUBLIC_PATHS = new Set(['/login', '/legal/user-agreement', '/legal/privacy-policy']);
@@ -25,6 +26,10 @@ export default function AuthGate({ children }: { children: React.ReactNode }) {
   }
 
   if (!authenticated && !PUBLIC_PATHS.has(location.pathname)) {
+    const profile = getStoreProfile();
+    if (profile && hasShopWxSession() && location.pathname !== '/login') {
+      return <Navigate to="/login?quick=1" replace state={{ from: location }} />;
+    }
     return <Navigate to="/login" replace state={{ from: location }} />;
   }