feat: add customer login page in SPA

- Created Login/index.tsx with styled form
- Added /auth/customer-login API endpoint (no admin perms required)
- Registered route in Routes.php
- Added /login route in customer-spa App.tsx
- Account page now redirects to SPA login instead of wp-login.php
- Login supports redirect param for post-login navigation

customer-spa/src/pages/Account/index.tsx

@@ -1,5 +1,5 @@
 import React from 'react';
-import { Routes, Route, Navigate } from 'react-router-dom';
+import { Routes, Route, Navigate, useLocation } from 'react-router-dom';
 import Container from '@/components/Layout/Container';
 import { AccountLayout } from './components/AccountLayout';
 import Dashboard from './Dashboard';
@@ -12,11 +12,12 @@ import AccountDetails from './AccountDetails';
 
 export default function Account() {
   const user = (window as any).woonoowCustomer?.user;
-  
+  const location = useLocation();
+
   // Redirect to login if not authenticated
   if (!user?.isLoggedIn) {
-    window.location.href = '/wp-login.php?redirect_to=' + encodeURIComponent(window.location.href);
-    return null;
+    const currentPath = location.pathname;
+    return <Navigate to={`/login?redirect=${encodeURIComponent(currentPath)}`} replace />;
   }
 
   return (