docs: add ZimaCube 2 blog post

[berry-13]

Summary

• Add a blog post about running LibreChat on the ZimaCube 2 with ZimaOS.
• Keep the 2026 roadmap pinned on the blog index while adding the new post.
• Include screenshots for storage, setup, registration, and model selection.

Validation

• Rebased on origin/main.
• Ran pnpm exec prettier --check app/blog/page.tsx content/blog/2026-02-18_2026_roadmap.mdx content/blog/2026-06-03_librechat_zimacube.mdx.

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Project	Deployment	Actions	Updated (UTC)
librechat-ai	Ready	Preview, Comment	Jun 27, 2026 4:50pm

[github-actions]

📦 Next.js Bundle Analysis for librechat.ai

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This PR introduced no changes to the JavaScript bundle! 🙌

[github-actions]

📦 Next.js Bundle Analysis for librechat.ai

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

[github-actions]

📦 Next.js Bundle Analysis for librechat.ai

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

[github-actions]

📦 Next.js Bundle Analysis for librechat.ai

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

[berry-13]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Another round soon, please!

Reviewed commit: 7cf221d755

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