change clai default model to gpt-4.1

[samuelcolvin]

OpenAI recommend 4.1 over 4o and say it's better, 4.1 is cheaper.

[hyperlint-ai]

PR Change Summary

Updated the default model in the CLI documentation to OpenAI's GPT-4.1, reflecting OpenAI's recommendation for improved performance and cost-effectiveness.

• Changed the default model from 'openai:gpt-4o' to 'openai:gpt-4.1' in the README and CLI documentation.
• Updated example commands and code snippets to use the new default model 'openai:gpt-4.1'.
• Removed references to the older model 'openai:gpt-4o' throughout the documentation.

Modified Files

• clai/README.md
• docs/cli.md

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