i18n(zh-CN): update modules/astro-assets.mdx

[fyihang]

Description (required)

Brings the zh-CN reference/modules/astro-assets.mdx translation up to date with the current English version (syncs 6 upstream commits).

Main changes synced:

• New font API sections: <Font /> (with cssVariable and preload), fontData, experimental_getFontFileURL(), FontData type, emitClientAsset() — these provide the anchors that the new zh-CN fonts pages link to (i18n(zh-CN): add guides/fonts.mdx #14452, i18n(zh-CN): add reference/font-provider-reference.mdx #14453)
• Removed the obsolete "responsive image properties" section and emitESMImage() (matching the English version)
• Updated densities/widths/sizes wording, inferSize behavior note, getImage() caution, and renamed 27 type sub-headings to match the English structure

Note for reviewers: guides/images.mdx (zh-CN) still links to the removed #响应式图片属性 anchor — that page needs its own update (tracked separately), matching the English change to #layout.

Terminology follows the Simplified Chinese translation guide and the new zh-CN fonts translation (#14452).

[astrobot-houston]

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Tracked Files

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zh-cn/reference/modules/astro-assets.mdx	Localization changed, will be marked as complete.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[github-actions]

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