docs: EU AI Act compliance guide for langfuse deployers

[BipinRimal314]

Summary

• EU AI Act compliance guide mapping this project's features to Articles 12, 13, 14, 50 and GDPR
• Scope check (Annex III), data flow diagram, practical code examples
• References AI Trace Auditor for automated scanning

What's covered

• Annex III scope check — is your deployment high-risk?
• Article 12 — Record-keeping coverage and gaps
• Article 13 — Transparency documentation
• Article 14 — Human oversight (natural persons, not automated controls)
• Article 50 — User-facing AI disclosure
• GDPR — Cross-border transfers, DPAs

Developed across 10 open-source AI framework compliance guides. Greptile automated review on the LiteLLM version caught and corrected Article 14, provider/deployer roles, and citation accuracy — all fixes incorporated.

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