debug: Add route registration success/failure logging

Added logging to verify:
1. register_routes() is called
2. register_rest_route() returns success/failure

This will show if route registration is actually working.

If we see FAILED, it means another plugin/route is conflicting.
If we see SUCCESS but get_products() not called, routing issue.

includes/Api/ProductsController.php

@@ -24,12 +24,15 @@ class ProductsController {
 	 * Register REST API routes
 	 */
 	public static function register_routes() {
+		error_log('WooNooW ProductsController::register_routes() START');
+		
 		// List products
-		register_rest_route('woonoow/v1', '/products', [
+		$result = register_rest_route('woonoow/v1', '/products', [
 			'methods' => 'GET',
 			'callback' => [__CLASS__, 'get_products'],
 			'permission_callback' => [Permissions::class, 'check_admin_permission'],
 		]);
+		error_log('WooNooW ProductsController: GET /products registered: ' . ($result ? 'SUCCESS' : 'FAILED'));
 		
 		// Get single product
 		register_rest_route('woonoow/v1', '/products/(?P<id>\d+)', [