feat: temp password in emails + WC page redirects to SPA

1. Temp password for auto-registered users:
   - Store password in _woonoow_temp_password user meta (CheckoutController)
   - Add {user_temp_password} and {login_url} variables (EmailRenderer)
   - Update new_customer email template to show credentials

2. WC page redirects to SPA routes:
   - Added redirect_wc_pages_to_spa() in TemplateOverride
   - Maps: /shop → /store/#/, /cart → /store/#/cart, etc.
   - /checkout → /store/#/checkout, /my-account → /store/#/account
   - Single products → /store/#/products/{slug}

3. Removed shortcode system:
   - Commented out Shortcodes::init() in Bootstrap
   - WC pages now redirect to SPA instead

includes/Api/CheckoutController.php

@@ -296,6 +296,10 @@ class CheckoutController {
                         // Link order to new user
                         $order->set_customer_id($new_user_id);
                         
+                        // Store temp password in user meta for email template
+                        // The real password is already set via wp_insert_user
+                        update_user_meta($new_user_id, '_woonoow_temp_password', $password);
+                        
                         // Set WooCommerce customer billing data
                         $customer = new \WC_Customer($new_user_id);