Add LangSmith vs MLflow comparison page

[AnanyaDBJ]

Summary

• Adds a new competitive comparison page at /langsmith-alternative (LangSmith vs MLflow)
• Follows the same format and component patterns as the existing /langfuse-alternative page
• Content is driven by the internal LangSmith battlecard, positioning MLflow's governance, end-to-end lifecycle, and framework-neutral advantages

Page Structure

The page includes the following sections:

1. Hero — positions MLflow as the governed, open-source alternative
2. What is LangSmith / What is MLflow — fair descriptions of both platforms
3. Quick Comparison (TL;DR) — side-by-side cards highlighting top differentiators
4. Open Source, Governance & Cost — MLflow's Apache 2.0 licensing, Unity Catalog governance, and cost advantage (pricing as a single line item, not a dedicated section)
5. Self-Hosting & Architecture — comparison table (MLflow open to all vs LangSmith Enterprise-only)
6. Tracing & Observability — code tabs comparing MLflow autolog (LangGraph, OpenAI, DSPy) vs LangSmith's approach, plus UI screenshots
7. Evaluation — feature checklist table covering judges, multi-turn eval, conversation simulation, prompt optimization
8. Prompt Management & Optimization — highlights MLflow's automated prompt optimization (GEPA, memAlign) which LangSmith lacks
9. AI Gateway — MLflow's built-in gateway vs LangSmith's absence of this capability
10. Summary — balanced conclusion acknowledging LangSmith strengths while positioning MLflow

Key Positioning Points

• Governance: Traces stored in Unity Catalog alongside all data assets (vs siloed in LangSmith)
• End-to-end lifecycle: Single platform for tracing, eval, optimization, and gateway
• Framework-neutral: 60+ integrations vs LangChain ecosystem lock-in
• Open source: Apache 2.0 / Linux Foundation vs closed-source proprietary
• Automated prompt optimization: Unique MLflow capability not available in LangSmith

Files Changed

• website/src/pages/langsmith-alternative.tsx — new page (1111 lines)
• website/static/img/langsmith-alternative/ — 7 image assets (MLflow screenshots reused from langfuse-alternative; LangSmith screenshots are placeholders that need real replacements before merge)

Note on Placeholder Images

Three LangSmith images (langsmith-logo.png, langsmith-tracing-ui.png, langsmith-eval-ui.png) are currently placeholders. These should be replaced with actual LangSmith UI screenshots before final merge.

Test plan

• Run npm run fmt and npm run typecheck in website/
• Verify page renders correctly at http://localhost:3000/langsmith-alternative
• Check all section anchors work with sidebar navigation
• Verify code tabs (LangGraph, OpenAI, DSPy) render with syntax highlighting
• Confirm comparison tables display correctly
• Replace placeholder LangSmith images with real screenshots

🤖 Generated with Claude Code