feat: Implement activity log system

## ✅ Activity Log System - Complete

### Backend Implementation

**1. Database Table**
- `ActivityLogTable.php` - Table creation and management
- Auto-creates on plugin init
- Indexed for performance (user_id, action, object, created_at)

**2. Logger Class**
- `Logger.php` - Main logging functionality
- `log()` - Log activities
- `get_activities()` - Query with filters
- `get_stats()` - Activity statistics
- `cleanup()` - Delete old logs

**3. REST API**
- `ActivityLogController.php` - REST endpoints
- GET `/activity-log` - List activities
- POST `/activity-log` - Create activity
- GET `/activity-log/stats` - Get statistics

### Features

**Logging:**
- User ID and name
- Action type (order.created, product.updated, etc.)
- Object type and ID
- Object name (auto-resolved)
- Description
- Metadata (JSON)
- IP address
- User agent
- Timestamp

**Querying:**
- Pagination
- Filter by action, object, user, date
- Search by description, object name, user name
- Sort by date (newest first)

**Statistics:**
- Total activities
- By action (top 10)
- By user (top 10)
- Date range filtering

### Activity Types

**Orders:**
- order.created, order.updated, order.status_changed
- order.payment_completed, order.refunded, order.deleted

**Products:**
- product.created, product.updated
- product.stock_changed, product.deleted

**Customers:**
- customer.created, customer.updated, customer.deleted

**Notifications:**
- notification.sent, notification.failed, notification.clicked

**Settings:**
- settings.updated, channel.toggled, event.toggled

### Integration

- Registered in Bootstrap
- REST API routes registered
- Ready for WooCommerce hooks
- Ready for frontend UI

---

**Next:** Frontend UI + WooCommerce hooks

includes/Core/ActivityLog/ActivityLogTable.php

@@ -0,0 +1,90 @@
+<?php
+/**
+ * Activity Log Database Table
+ * 
+ * Creates and manages the activity log database table.
+ * 
+ * @package WooNooW\Core\ActivityLog
+ */
+
+namespace WooNooW\Core\ActivityLog;
+
+class ActivityLogTable {
+	
+	/**
+	 * Table name (without prefix)
+	 */
+	const TABLE_NAME = 'woonoow_activity_log';
+	
+	/**
+	 * Database version
+	 */
+	const DB_VERSION = '1.0.0';
+	
+	/**
+	 * Get full table name with prefix
+	 * 
+	 * @return string
+	 */
+	public static function get_table_name() {
+		global $wpdb;
+		return $wpdb->prefix . self::TABLE_NAME;
+	}
+	
+	/**
+	 * Create or update table
+	 */
+	public static function create_table() {
+		global $wpdb;
+		
+		$table_name = self::get_table_name();
+		$charset_collate = $wpdb->get_charset_collate();
+		
+		$sql = "CREATE TABLE IF NOT EXISTS {$table_name} (
+			id BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+			user_id BIGINT UNSIGNED NOT NULL,
+			user_name VARCHAR(255) NOT NULL,
+			action VARCHAR(50) NOT NULL,
+			object_type VARCHAR(50) NOT NULL,
+			object_id BIGINT UNSIGNED NOT NULL,
+			object_name VARCHAR(255),
+			description TEXT,
+			metadata LONGTEXT,
+			ip_address VARCHAR(45),
+			user_agent TEXT,
+			created_at DATETIME NOT NULL,
+			
+			INDEX idx_user_id (user_id),
+			INDEX idx_action (action),
+			INDEX idx_object (object_type, object_id),
+			INDEX idx_created_at (created_at)
+		) {$charset_collate};";
+		
+		require_once ABSPATH . 'wp-admin/includes/upgrade.php';
+		dbDelta($sql);
+		
+		// Store version
+		update_option('woonoow_activity_log_db_version', self::DB_VERSION);
+	}
+	
+	/**
+	 * Check if table exists
+	 * 
+	 * @return bool
+	 */
+	public static function table_exists() {
+		global $wpdb;
+		$table_name = self::get_table_name();
+		return $wpdb->get_var("SHOW TABLES LIKE '{$table_name}'") === $table_name;
+	}
+	
+	/**
+	 * Drop table (for uninstall)
+	 */
+	public static function drop_table() {
+		global $wpdb;
+		$table_name = self::get_table_name();
+		$wpdb->query("DROP TABLE IF EXISTS {$table_name}");
+		delete_option('woonoow_activity_log_db_version');
+	}
+}