Fix image upload structure for Miravia API compliance

🔧 Bug Fixes:
- Fixed product image structure to match Miravia API requirements
- Updated MiraviaProduct.php getData() method to wrap images in {"Image": [...]} format
- Updated MiraviaCombination.php getData() method to wrap SKU images properly
- Resolved error "[4224] The Main image of the product is required"

📋 Changes:
- Modified getData() methods to transform flat image arrays to nested structure
- Product images: images[] → Images: {"Image": [...]}
- SKU images: images[] → Images: {"Image": [...]}
- Maintains backward compatibility for empty image arrays

🎯 Impact:
- Product uploads will now pass Miravia's image validation
- Both product-level and SKU-level images properly formatted
- Complies with official Miravia API documentation structure

🤖 Generated with Claude Code (https://claude.ai/code)

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

connector-miravia/classes/class.api.php

@@ -19,7 +19,8 @@ if( !class_exists('APIMIRAVIA') ) {
                 'miravia_print_label',
                 'miravia_get_brands',
                 'miravia_connect_product',
-                'disconnect_product_miravia'
+                'disconnect_product_miravia',
+                'test_miravia_api_connection'
             );
             foreach( $actionsPrivate as $action ){
                 add_action( 'wp_ajax_'.$action, array( $this, $action ) );
@@ -547,6 +548,44 @@ if( !class_exists('APIMIRAVIA') ) {
             wp_die();
         }
 
+        function test_miravia_api_connection() {
+            if (!current_user_can('manage_options')) {
+                wp_die('Unauthorized');
+            }
+            
+            if (!wp_verify_nonce($_POST['nonce'], 'test_miravia_api')) {
+                wp_send_json_error('Invalid nonce');
+                return;
+            }
+            
+            // Check if direct API is enabled
+            if (get_option('miravia_direct_api', '0') !== '1') {
+                wp_send_json_error('Direct API access is not enabled');
+                return;
+            }
+            
+            try {
+                require_once plugin_dir_path(__FILE__) . 'shared/MiraviaSdk.php';
+                $sdk = new MiraviaSdk();
+                
+                if (!$sdk->isConfigured()) {
+                    wp_send_json_error('SDK not configured. Please check your API credentials.');
+                    return;
+                }
+                
+                $test_result = $sdk->testConnection();
+                
+                if ($test_result['success']) {
+                    wp_send_json_success(['message' => $test_result['message']]);
+                } else {
+                    wp_send_json_error($test_result['error']);
+                }
+                
+            } catch (Exception $e) {
+                wp_send_json_error('Connection test failed: ' . $e->getMessage());
+            }
+        }
+
         function miravia_update_product() {
             if ( !current_user_can( 'manage_woocommerce' ) ) { exit; }
             $result = array(