docs: add analytics to enterprise docs dns and cert requirements

[aivong-openhands]

• I have read and reviewed the documentation changes to the best of my ability.
• If the change is significant, I have run the documentation site locally and confirmed it renders as expected.

Summary of changes

[all-hands-bot]

🟢 Good taste - Clean documentation update that correctly documents the analytics subdomain requirement.

Context: The analytics.app.<your-domain> subdomain hosts the Laminar UI for observability and tracing (as referenced in /enterprise/analytics.mdx). This change ensures users configure DNS and TLS certificates correctly during installation.

What's Good:

• Follows the exact pattern of existing subdomain entries
• Updates both the DNS table and the test script consistently
• Properly alphabetized between app. and auth.app.
• Covered by the TLS certificate SAN requirements ("for all of the above domains")

[RISK ASSESSMENT]

• [Overall PR] ⚠️ Risk Assessment: 🟢 LOW

This is a documentation-only change that improves accuracy by documenting an existing product requirement. No code changes, no breaking changes, no security concerns. The change correctly reflects the infrastructure needs for the analytics feature.

VERDICT:
✅ Worth merging: Documentation accurately reflects product requirements

KEY INSIGHT:
Complete and correct documentation of infrastructure requirements prevents deployment issues.

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