Add debug logging and expand Google product matching

- Log sample Google product structure to help debug matching
- Expand matching to check nested 'attributes' field (new API format)
- Extract offerId from productId field (channel:lang:country:id format)
- Extract offerId from name field (resource path format)
- Return debug info in AJAX response (sample keys, sample product)
- Log debug info in browser console
- Remove alert popup since button is now working

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

assets/js/admin.js

@@ -202,7 +202,6 @@ console.log('Informatiq Smart Pricing: Script loaded');
 			e.preventDefault();
 
 			console.log('=== COMPARE PRODUCTS CLICKED ===');
-			alert('Compare Products button clicked! Check console for details.');
 
 			var $button = $(this);
 			var $spinner = $button.next('.spinner');
@@ -244,6 +243,16 @@ console.log('Informatiq Smart Pricing: Script loaded');
 				success: function(response) {
 					console.log('AJAX success callback');
 					console.log('AJAX response:', response);
+
+					// Log debug info if available.
+					if (response.data && response.data.debug) {
+						console.log('=== DEBUG INFO ===');
+						console.log('Sample Google product:', response.data.debug.sample_google_product);
+						console.log('Sample indexed keys:', response.data.debug.sample_google_keys);
+						console.log('Total indexed entries:', response.data.debug.index_count);
+						console.log('==================');
+					}
+
 					$status.hide();
 
 					if (response.success) {