feat: initial implementation of WooList phpList Integration plugin v1.0.0

- phpList REST API wrapper with subscriber get-or-create + list assignment
- WooCommerce Settings tab (5 sections: connection, orders, signup, newsletter)
- Test Connection button via admin-post action
- Hooks for order completed/cancelled and user_register events
- [woolist_newsletter] shortcode with jQuery AJAX, fixed & auto-generated coupons
- Responsive front-end form styles and JS with loading/success/error states

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

woolist-phplist/includes/class-woolist-hooks.php

@@ -0,0 +1,104 @@
+<?php
+/**
+ * WooCommerce and WordPress action hooks for WooList.
+ *
+ * @package WooList
+ */
+
+defined( 'ABSPATH' ) || exit;
+
+class WooList_Hooks {
+
+	/** @var WooList_API */
+	private WooList_API $api;
+
+	public function __construct( WooList_API $api ) {
+		$this->api = $api;
+
+		add_action( 'woocommerce_order_status_completed', [ $this, 'on_order_completed' ] );
+		add_action( 'woocommerce_order_status_cancelled', [ $this, 'on_order_cancelled' ] );
+		add_action( 'user_register', [ $this, 'on_user_register' ] );
+	}
+
+	/**
+	 * Sync billing email to phpList when an order is marked completed.
+	 *
+	 * @param int $order_id WooCommerce order ID.
+	 */
+	public function on_order_completed( int $order_id ): void {
+		if ( get_option( 'woolist_sync_completed' ) !== 'yes' ) {
+			return;
+		}
+
+		$list_id = (int) get_option( 'woolist_completed_list_id', 0 );
+		if ( $list_id < 1 ) {
+			error_log( '[WooList] Completed order sync enabled but no list ID configured.' );
+			return;
+		}
+
+		$order = wc_get_order( $order_id );
+		if ( ! $order ) {
+			return;
+		}
+
+		$email = $order->get_billing_email();
+		if ( ! is_email( $email ) ) {
+			return;
+		}
+
+		$this->api->subscribe_email_to_list( $email, $list_id );
+	}
+
+	/**
+	 * Sync billing email to phpList when an order is cancelled.
+	 *
+	 * @param int $order_id WooCommerce order ID.
+	 */
+	public function on_order_cancelled( int $order_id ): void {
+		if ( get_option( 'woolist_sync_cancelled' ) !== 'yes' ) {
+			return;
+		}
+
+		$list_id = (int) get_option( 'woolist_cancelled_list_id', 0 );
+		if ( $list_id < 1 ) {
+			error_log( '[WooList] Cancelled order sync enabled but no list ID configured.' );
+			return;
+		}
+
+		$order = wc_get_order( $order_id );
+		if ( ! $order ) {
+			return;
+		}
+
+		$email = $order->get_billing_email();
+		if ( ! is_email( $email ) ) {
+			return;
+		}
+
+		$this->api->subscribe_email_to_list( $email, $list_id );
+	}
+
+	/**
+	 * Sync new user email to phpList when a WordPress account is created.
+	 *
+	 * @param int $user_id Newly registered user ID.
+	 */
+	public function on_user_register( int $user_id ): void {
+		if ( get_option( 'woolist_sync_signup' ) !== 'yes' ) {
+			return;
+		}
+
+		$list_id = (int) get_option( 'woolist_signup_list_id', 0 );
+		if ( $list_id < 1 ) {
+			error_log( '[WooList] Account signup sync enabled but no list ID configured.' );
+			return;
+		}
+
+		$user = get_userdata( $user_id );
+		if ( ! $user || ! is_email( $user->user_email ) ) {
+			return;
+		}
+
+		$this->api->subscribe_email_to_list( $user->user_email, $list_id );
+	}
+}