Example with iron framework should use generic client

# Project Improvement

Use the client from the `support` module which is also used by all other frameworks. This would guarantee the page looks consistent across examples. It also ensures supporting all features is easier.

Find the example using the iron framework and locate the support module's generic client. Compare with other framework examples to understand the consistent client usage. Update the iron example to use the generic client, then verify the example builds and runs correctly.

Do mô hình lập chỉ mục viết ra từ nội dung của issue.