docs: add Markstream Nuxt streaming guide

[Simon-He95]

Adds a focused Nuxt guide for rendering incomplete Markdown while LLM tokens are streaming.

The guide covers Nuxt SSR-first rendering and the client boundaries needed for optional browser-only features such as Mermaid, KaTeX, and code blocks.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 4f65966a-e8b9-468e-a1b0-f5ae3aa548aa

📥 Commits

Reviewing files that changed from the base of the PR and between 111ad3d and 6ebd529.

📒 Files selected for processing (1)

• README.md

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📝 Walkthrough

Walkthrough

Added a new “Streaming Markdown for AI Chat in Nuxt” bullet and description to the Articles list in README.md.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title matches the docs change and the new Nuxt streaming guide link, even if "Markstream" is slightly unclear.
Description check	✅ Passed	The description is directly about the Nuxt streaming Markdown guide added by this PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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