Add deprecation warning for Claude 3.5 Haiku on LLM Gateway overview page

[devin-ai-integration]

Summary

Adds a warning callout on the LLM Gateway overview page indicating that Claude 3.5 Haiku (claude-3-5-haiku-20241022) will be deprecated on February 19, 2026. The warning is placed after the Anthropic Claude models table and before the existing Note callout (about Amazon Bedrock fallback), which precedes the OpenAI GPT models section.

Updates since last revision

• Moved the Warning callout to appear before the Note callout per reviewer feedback

Review & Testing Checklist for Human

• Verify the deprecation date (February 19, 2026) is correct
• Verify the model identifier (claude-3-5-haiku-20241022) matches the model being deprecated
• Preview the docs to confirm the <Warning> component renders correctly and appears before the <Note> component

Notes

• Link to Devin run: https://app.devin.ai/sessions/3d24f753bd2d4306bbac174cdaf83aa8
• Requested by: Lee Vaughn (@LeeVaughn)

[devin-ai-integration]

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