docs(devtools-ui-kit): mark package as deprecated

[antfubot]

Summary

Marks @nuxt/devtools-ui-kit as deprecated and stops encouraging new
adoption of it:

• Add a deprecated field to packages/devtools-ui-kit/package.json.
• Replace the WIP warning in the package README.md with a deprecation
  notice.
• Add a deprecation callout to the /module/ui-kit docs page and drop
  the line recommending the Starter Template as the way to pull in the
  UI Kit for new module integrations.

Existing consumers are unaffected — no code, components, or the
module-starter playground dependency were touched.

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[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 Plus

Run ID: 9ec42b0d-4bde-4155-ad2f-135600301673

📥 Commits

Reviewing files that changed from the base of the PR and between 6eeec69 and 48d04ad.

📒 Files selected for processing (3)

• docs/content/2.module/2.ui-kit.md
• packages/devtools-ui-kit/README.md
• packages/devtools-ui-kit/package.json

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📝 Walkthrough

Walkthrough

The package metadata now declares @nuxt/devtools-ui-kit deprecated and links to the UI kit module documentation. The package README replaces its work-in-progress warning with deprecation guidance. The UI Kit module documentation adds a deprecation callout and removes the Starter Template recommendation from the installation section.

Estimated code review effort: 1 (Trivial) | ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: marking the devtools-ui-kit package as deprecated.
Description check	✅ Passed	The description matches the changeset and accurately describes the deprecation updates across docs and package metadata.
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
• Commit unit tests in branch docs/deprecate-devtools-ui-kit

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