feat: Add licensing module backend

- LicensingSettings.php with key format, activation limits, expiry settings
- LicenseManager.php with key generation, activation/deactivation, validation
- LicensingModule.php with WooCommerce product meta integration
- LicensesController.php with admin, customer, and public API endpoints
- Database tables: woonoow_licenses, woonoow_license_activations
- has_settings enabled in ModuleRegistry

includes/Modules/LicensingSettings.php

@@ -0,0 +1,95 @@
+<?php
+/**
+ * Licensing Module Settings
+ *
+ * @package WooNooW\Modules
+ */
+
+namespace WooNooW\Modules;
+
+if (!defined('ABSPATH')) exit;
+
+class LicensingSettings {
+    
+    /**
+     * Initialize the settings
+     */
+    public static function init() {
+        add_filter('woonoow/module_settings_schema', [__CLASS__, 'register_schema']);
+    }
+    
+    /**
+     * Register licensing settings schema
+     */
+    public static function register_schema($schemas) {
+        $schemas['licensing'] = [
+            'license_key_format' => [
+                'type' => 'select',
+                'label' => __('License Key Format', 'woonoow'),
+                'description' => __('Format for generated license keys', 'woonoow'),
+                'options' => [
+                    'uuid' => 'UUID (e.g., a1b2c3d4-e5f6-7890-abcd-ef1234567890)',
+                    'serial' => 'Serial (e.g., XXXX-XXXX-XXXX-XXXX)',
+                    'alphanumeric' => 'Alphanumeric (e.g., ABC123DEF456)',
+                ],
+                'default' => 'serial',
+            ],
+            'license_key_prefix' => [
+                'type' => 'text',
+                'label' => __('License Key Prefix', 'woonoow'),
+                'description' => __('Optional prefix for license keys (e.g., PRO-, ENT-)', 'woonoow'),
+                'placeholder' => 'e.g., PRO-',
+                'default' => '',
+            ],
+            'default_activation_limit' => [
+                'type' => 'number',
+                'label' => __('Default Activation Limit', 'woonoow'),
+                'description' => __('Default max activations per license (0 = unlimited). Can be overridden per product.', 'woonoow'),
+                'default' => 1,
+                'min' => 0,
+                'max' => 100,
+            ],
+            'allow_deactivation' => [
+                'type' => 'toggle',
+                'label' => __('Allow Deactivation', 'woonoow'),
+                'description' => __('Allow customers to deactivate their licenses to free up activation slots', 'woonoow'),
+                'default' => true,
+            ],
+            'license_expiry_enabled' => [
+                'type' => 'toggle',
+                'label' => __('Enable License Expiry', 'woonoow'),
+                'description' => __('Licenses expire after a set period (for subscription-based products)', 'woonoow'),
+                'default' => false,
+            ],
+            'default_expiry_days' => [
+                'type' => 'number',
+                'label' => __('Default Expiry (Days)', 'woonoow'),
+                'description' => __('Default license validity period in days (0 = never expires)', 'woonoow'),
+                'default' => 365,
+                'min' => 0,
+            ],
+            'block_expired_activations' => [
+                'type' => 'toggle',
+                'label' => __('Block Expired Activations', 'woonoow'),
+                'description' => __('Prevent new activations for expired licenses (deactivations still allowed)', 'woonoow'),
+                'default' => true,
+            ],
+            'send_expiry_reminder' => [
+                'type' => 'toggle',
+                'label' => __('Send Expiry Reminders', 'woonoow'),
+                'description' => __('Send email reminders before license expires', 'woonoow'),
+                'default' => true,
+            ],
+            'expiry_reminder_days' => [
+                'type' => 'number',
+                'label' => __('Reminder Days Before Expiry', 'woonoow'),
+                'description' => __('Send reminder this many days before expiry', 'woonoow'),
+                'default' => 7,
+                'min' => 1,
+                'max' => 30,
+            ],
+        ];
+        
+        return $schemas;
+    }
+}