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/Core/Bootstrap.php

@@ -45,7 +45,7 @@ class Bootstrap {
         
         // Frontend (customer-spa)
         FrontendAssets::init();
-        Shortcodes::init();
+        // Note: Shortcodes removed - WC pages now redirect to SPA routes via TemplateOverride
         TemplateOverride::init();
         new PageAppearance();