Docs: Chinese (zh-CN) website translation is outdated vs English docs

Describe the issue

The Chinese (zh-CN) translation of the Immer website at website/i18n/zh-CN/ appears to be behind the English documentation. The existing translation was great community work but may be missing newer sections like array methods and v11 changes.

Suggested improvement

Update the zh-CN translated documentation to cover:

• Array manipulation methods introduced in recent versions
• v11 API changes
• Any new sections added since the translation was last updated

Additional context

Immer has ~27M weekly downloads. Keeping translations current significantly improves accessibility for the large Chinese-speaking developer community.