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/Frontend/TemplateOverride.php

@@ -13,6 +13,9 @@ class TemplateOverride
      */
     public static function init()
     {
+        // Redirect WooCommerce pages to SPA routes early (before template loads)
+        add_action('template_redirect', [__CLASS__, 'redirect_wc_pages_to_spa'], 5);
+        
         // Hook to wp_loaded with priority 10 (BEFORE WooCommerce's priority 20)
         // This ensures we process add-to-cart before WooCommerce does
         add_action('wp_loaded', [__CLASS__, 'intercept_add_to_cart'], 10);
@@ -93,6 +96,59 @@ class TemplateOverride
         }, 1);
     }
 
+    /**
+     * Redirect WooCommerce pages to SPA routes
+     * Maps: /shop → /store/#/, /cart → /store/#/cart, etc.
+     */
+    public static function redirect_wc_pages_to_spa()
+    {
+        // Get SPA page URL
+        $appearance_settings = get_option('woonoow_appearance_settings', []);
+        $spa_page_id = $appearance_settings['general']['spa_page'] ?? 0;
+        
+        if (!$spa_page_id) {
+            return; // No SPA page configured
+        }
+        
+        // Already on SPA page, don't redirect
+        global $post;
+        if ($post && $post->ID == $spa_page_id) {
+            return;
+        }
+        
+        $spa_url = trailingslashit(get_permalink($spa_page_id));
+        
+        // Check which WC page we're on and redirect
+        if (is_shop()) {
+            wp_redirect($spa_url . '#/', 302);
+            exit;
+        }
+        
+        if (is_product()) {
+            global $product;
+            if ($product) {
+                $slug = $product->get_slug();
+                wp_redirect($spa_url . '#/products/' . $slug, 302);
+                exit;
+            }
+        }
+        
+        if (is_cart()) {
+            wp_redirect($spa_url . '#/cart', 302);
+            exit;
+        }
+        
+        if (is_checkout() && !is_order_received_page()) {
+            wp_redirect($spa_url . '#/checkout', 302);
+            exit;
+        }
+        
+        if (is_account_page()) {
+            wp_redirect($spa_url . '#/account', 302);
+            exit;
+        }
+    }
+
     /**
      * Disable canonical redirects for SPA routes
      * This prevents WordPress from redirecting /product/slug URLs