fix: Backend taxonomy API response format mismatch

Problem: Frontend expects term_id but backend returns id, causing undefined in update/delete URLs

Changes:
1. Categories GET endpoint: Changed 'id' to 'term_id', added 'description' field
2. Tags GET endpoint: Changed 'id' to 'term_id', added 'description' field
3. Attributes GET endpoint: Changed 'id' to 'attribute_id', added 'attribute_public' field

This ensures backend response matches frontend TypeScript interfaces:
- Category interface expects: term_id, name, slug, description, parent, count
- Tag interface expects: term_id, name, slug, description, count
- Attribute interface expects: attribute_id, attribute_name, attribute_label, etc.

Files Modified:
- includes/Api/ProductsController.php (get_categories, get_tags, get_attributes)

Result:
✅ Update/delete operations now work - IDs are correctly passed in URLs
✅ No more /products/categories/undefined errors

includes/Api/ProductsController.php

@@ -575,9 +575,10 @@ class ProductsController {
 		$categories = [];
 		foreach ($terms as $term) {
 			$categories[] = [
-				'id' => $term->term_id,
+				'term_id' => $term->term_id,
 				'name' => $term->name,
 				'slug' => $term->slug,
+				'description' => $term->description,
 				'parent' => $term->parent,
 				'count' => $term->count,
 			];
@@ -602,9 +603,10 @@ class ProductsController {
 		$tags = [];
 		foreach ($terms as $term) {
 			$tags[] = [
-				'id' => $term->term_id,
+				'term_id' => $term->term_id,
 				'name' => $term->name,
 				'slug' => $term->slug,
+				'description' => $term->description,
 				'count' => $term->count,
 			];
 		}
@@ -621,11 +623,12 @@ class ProductsController {
 		
 		foreach ($attributes as $attribute) {
 			$result[] = [
-				'id' => $attribute->attribute_id,
-				'name' => $attribute->attribute_name,
-				'label' => $attribute->attribute_label,
-				'type' => $attribute->attribute_type,
-				'orderby' => $attribute->attribute_orderby,
+				'attribute_id' => $attribute->attribute_id,
+				'attribute_name' => $attribute->attribute_name,
+				'attribute_label' => $attribute->attribute_label,
+				'attribute_type' => $attribute->attribute_type,
+				'attribute_orderby' => $attribute->attribute_orderby,
+				'attribute_public' => $attribute->attribute_public,
 			];
 		}