i18n(ru): add middleware

[nasty23-star]

Description

• Translated the Middleware page into Russian

• Discord username: goToAttack

[astrobot-houston]

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Tracked Files

File	Note
ru/guides/middleware.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.

[astrobot-houston]

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