docs(config): add claude haiku 5.5 model configuration

[Artem-Zahumonnyi]

Summary

Adds Claude Haiku 5.5 model configuration to the LiteLLM Model Configuration reference page.

Changes

• Added claude-haiku-5-5 entry to the AWS Bedrock Models reference table
• Added #### Claude Haiku 5.5 configuration section under ### Claude Haiku with EU region YAML example

Testing

• Tested locally with npm start
• All pages render correctly
• Images display properly
• Internal links work
• Sidebar navigation works

Quality Checks

• npm run check passes (typecheck + lint + commitlint)
• No MDX compilation errors
• No raw angle brackets
• Sidebar references document IDs (not filenames)
• Images stored locally next to content (not in static/img/)
• Commit messages follow Conventional Commits
• No secrets or credentials in documentation

Additional Notes

Configuration based on provided model params:

• Model: bedrock/eu.anthropic.claude-haiku-5-5
• Region: eu-central-1
• Credential: default_aws_bedrock_credential

[github-actions]

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