feat: Add all WooCommerce order status events

Added missing order status events that were not showing in admin UI.

New Events Added (Staff + Customer):
- Order On-Hold (awaiting payment)
- Order Failed (payment/processing failed)
- Order Refunded (full refund processed)
- Order Pending (initial order state)

Changes:
1. EventRegistry.php - Added 8 new event definitions
2. DefaultTemplates.php - Added 8 new email templates
3. DefaultTemplates.php - Added subject lines for all new events

Now Available in Admin:
- Staff: 11 order events total
- Customer: 12 events total (including new customer)

All events can be toggled on/off per channel (email/push) in admin UI.

includes/Core/Notifications/EventRegistry.php

@@ -97,6 +97,42 @@ class EventRegistry {
 				'wc_email' => '',
 				'enabled' => true,
 			],
+			'order_on_hold' => [
+				'id' => 'order_on_hold',
+				'label' => __('Order On-Hold', 'woonoow'),
+				'description' => __('When order is awaiting payment', 'woonoow'),
+				'category' => 'orders',
+				'recipient_type' => 'staff',
+				'wc_email' => '',
+				'enabled' => true,
+			],
+			'order_failed' => [
+				'id' => 'order_failed',
+				'label' => __('Order Failed', 'woonoow'),
+				'description' => __('When order fails', 'woonoow'),
+				'category' => 'orders',
+				'recipient_type' => 'staff',
+				'wc_email' => 'failed_order',
+				'enabled' => true,
+			],
+			'order_refunded' => [
+				'id' => 'order_refunded',
+				'label' => __('Order Refunded', 'woonoow'),
+				'description' => __('When order is refunded', 'woonoow'),
+				'category' => 'orders',
+				'recipient_type' => 'staff',
+				'wc_email' => '',
+				'enabled' => true,
+			],
+			'order_pending' => [
+				'id' => 'order_pending',
+				'label' => __('Order Pending', 'woonoow'),
+				'description' => __('When order is created (pending payment)', 'woonoow'),
+				'category' => 'orders',
+				'recipient_type' => 'staff',
+				'wc_email' => '',
+				'enabled' => true,
+			],
 			
 			// CUSTOMER EVENTS
 			'order_placed_customer' => [
@@ -171,6 +207,42 @@ class EventRegistry {
 				'wc_email' => 'customer_new_account',
 				'enabled' => true,
 			],
+			'order_on_hold_customer' => [
+				'id' => 'order_on_hold',
+				'label' => __('Order On-Hold', 'woonoow'),
+				'description' => __('When order is awaiting payment', 'woonoow'),
+				'category' => 'orders',
+				'recipient_type' => 'customer',
+				'wc_email' => 'customer_on_hold_order',
+				'enabled' => true,
+			],
+			'order_failed_customer' => [
+				'id' => 'order_failed',
+				'label' => __('Order Failed', 'woonoow'),
+				'description' => __('When order fails', 'woonoow'),
+				'category' => 'orders',
+				'recipient_type' => 'customer',
+				'wc_email' => 'customer_failed_order',
+				'enabled' => true,
+			],
+			'order_refunded_customer' => [
+				'id' => 'order_refunded',
+				'label' => __('Order Refunded', 'woonoow'),
+				'description' => __('When order is refunded', 'woonoow'),
+				'category' => 'orders',
+				'recipient_type' => 'customer',
+				'wc_email' => 'customer_refunded_order',
+				'enabled' => true,
+			],
+			'order_pending_customer' => [
+				'id' => 'order_pending',
+				'label' => __('Order Pending', 'woonoow'),
+				'description' => __('When order is created (pending payment)', 'woonoow'),
+				'category' => 'orders',
+				'recipient_type' => 'customer',
+				'wc_email' => '',
+				'enabled' => true,
+			],
 		];
 		
 		/**