docs(self-hosting): add Render v4 deployment

[anurag]

Summary

• Add a production-scale Langfuse v4 deployment guide for the Render Blueprint.
• Add Render to the production-scale deployment options alongside Railway.
• Clarify that the existing Railway template deploys Langfuse v3.

Why

The Render Blueprint deploys the Langfuse web service, worker, and data stores as separate Render resources.

User impact

Users can open the Render guide, review the resources and production requirements, and start a Blueprint deployment from the Deploy to Render button.

Validation

• npx --yes prettier@3.8.3 --experimental-cli --check .
• node scripts/check-h1-headings.js
• git diff --check

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Note

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Greptile Summary

Adds a production-scale Render Blueprint deployment guide for Langfuse v4 and distinguishes the existing Railway option as v3.

• Adds Render to deployment navigation and the production-scale deployment list.
• Documents the Blueprint's services, storage, operational considerations, and deployment link.
• Reuses the shared self-hosted feature overview.

Confidence Score: 4/5

The PR appears safe to merge after addressing the non-blocking MDX import-placement issue.

The deployment navigation and documentation changes are coherent, with only the new page's late import violating the repository's required module organization.

Files Needing Attention: content/self-hosting/deployment/render.mdx

Prompt To Fix All With AI

### Issue 1
content/self-hosting/deployment/render.mdx:38
**Late MDX component import**

The `SelfHostFeatures` import appears after the rendered page content instead of at the top of the MDX module, making the page's dependencies harder to identify and violating the repository's required import organization.

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For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

_{Reviews (1): Last reviewed commit: "docs(self-hosting): refine Render deploy..." | Re-trigger Greptile}

Context used (3)

• Rule used - Move imports to the top of the module instead of p... (source)

Learned From
langfuse/langfuse-python#1387

• Knowledge Base — Content and MDX Build Pipeline
• Knowledge Base — Self-Hosting, Security, and Cloud/Pricing Content

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