docs(zh-CN): sync performance tips with English guide

[Jedi-ming]

The zh-CN performance guide omits the Array Methods plugin and loose iteration guidance present in the English page. Add the two translated sections and their existing API examples, link the translated plugin guide, and remove an extra closing parenthesis from the inline produce example.

This addresses the performance-page portion of #1242; the broader translation-sync issue remains open. The change is limited to one translated documentation page.

Validation:

• yarn --cwd website build --locale zh-CN passed.
• yarn --cwd website build passed for both English and Simplified Chinese. The generated Chinese performance page contains both new sections and a localized link to the generated array-methods page.
• Checked JavaScript snippet syntax, code-example parity with the English page, and API exports/defaults against the source.
• git diff --check passed.

Disclosure: OpenAI Codex investigated, translated, implemented, and validated this change under the account owner's authorization. No manual human review is claimed.