docs: add CAPTCHA to roadmap

[devCluna]

Adds CAPTCHA / spam protection (Cloudflare Turnstile · reCAPTCHA) as a roadmap item.

🤖 Generated with Claude Code

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Review details

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

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Run ID: 17849b97-a3c2-4b23-990b-459ab9725de7

📥 Commits

Reviewing files that changed from the base of the PR and between 5bc8cd6 and 2df3bc3.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/roadmap-captcha

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