fix: 删除分类改为直接删除

src/main/java/com/example/building/service/impl/ProductServiceImpl.java

@@ -68,16 +68,9 @@ public class ProductServiceImpl implements ProductService {
 
     /**
      * 删除分类
-     * 检查是否有商品使用该分类，存在则不允许删除
      */
     @Override
     public void deleteCategory(String id) {
-        // 检查是否有商品使用该分类
-        Long count = productMapper.selectCount(new LambdaQueryWrapper<Product>()
-                .eq(Product::getCategoryId, id));
-        if (count > 0) {
-            throw new RuntimeException("该分类下有商品，无法删除");
-        }
         categoryMapper.deleteById(id);
     }