i18n(zh-cn): add media.mdx

[Nin3lee]

Description (required)

add media.mdx

Related issues & labels (optional)

• Adds Hosted Media / DAM section to Content Management section #9182
• Suggested label: i18n

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Tracked Files

Locale	File	Note
zh-cn	guides/media.mdx	Localization added, 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.

[liruifengv]

LGTM!