fix: licensing table creation, consistent meta keys, checkout virtual detection

1. License table auto-creation:
   - Added ensure_tables() check on plugins_loaded
   - Tables created automatically if missing

2. Consistent licensing meta keys:
   - ProductsController now uses _woonoow_licensing_enabled
   - Matches LicensingModule and LicenseManager

3. Checkout virtual-only detection:
   - Added needs_shipping to Cart interface
   - Checkout uses cart.needs_shipping from WooCommerce API
   - Fallback to item-level virtual/downloadable check

4. Login redirect for logged-in users added previously

includes/Modules/Licensing/LicensingModule.php

@@ -37,10 +37,25 @@ class LicensingModule {
      */
     public static function maybe_init_manager() {
         if (ModuleRegistry::is_enabled('licensing')) {
+            // Ensure tables exist
+            self::ensure_tables();
             LicenseManager::init();
         }
     }
     
+    /**
+     * Ensure database tables exist
+     */
+    private static function ensure_tables() {
+        global $wpdb;
+        $table = $wpdb->prefix . 'woonoow_licenses';
+        
+        // Check if table exists
+        if ($wpdb->get_var("SHOW TABLES LIKE '$table'") !== $table) {
+            LicenseManager::create_tables();
+        }
+    }
+    
     /**
      * Handle module enable
      */