docs: add Artifacts namespace delete API

[dinasaur404]

Summary

• Document DELETE /artifacts/namespaces/:namespace in the Artifacts REST API reference
• Note that namespaces must be empty before deletion
• Add 204, 404, and 409 response status semantics

Validation

• prettier --check src/content/docs/artifacts/api/rest-api.mdx (passed in OpenCode session)
• git diff --check (passed)
• pnpm run check (passed in OpenCode session with Node-version warning override; 0 errors, 4 existing hints)
• RUN_LINK_CHECK=true pnpm run build attempted but timed out after 15 minutes while generating changelog pages

[cloudflare-docs-bot]

Review

✅ No issues found in commit d1faf45.

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[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
/src/content/docs/artifacts/	@elithrar, @dmmulroy, @mattzcarey, @dinasaur404, @whoiskatrin, @cloudflare/product-owners

[github-actions]

Preview URL: https://d1faf453.preview.developers.cloudflare.com
Preview Branch URL: https://docs-artifacts-delete-namespace.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/artifacts/api/rest-api/	https://docs-artifacts-delete-namespace.preview.developers.cloudflare.com/artifacts/api/rest-api/