Remove unsupported models from docs

[steven10a]

• Removed nano models from benchmark results
• Updated graphs to not show nano
• Removed any mention or use of nano models in examples or code snippets in docs

[Copilot]

Pull Request Overview

This PR removes references to deprecated gpt-4.1-nano and gpt-5-nano model variants from the codebase, replacing them with gpt-4.1-mini in code examples and removing their benchmark data from documentation.

• Updated example code to use gpt-4.1-mini instead of gpt-4.1-nano
• Removed benchmark performance data for nano model variants from documentation
• Updated documentation commentary to reference gpt-4.1-mini as the recommended low-latency model

Reviewed Changes

Copilot reviewed 10 out of 14 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
examples/basic/suppress_tripwire.ts	Updated model references from gpt-4.1-nano-2025-04-14 to gpt-4.1-mini-2025-04-14
examples/basic/streaming.ts	Updated model references from gpt-4.1-nano to gpt-4.1-mini
examples/basic/multiturn_with_prompt_injection_detection.ts	Updated model references from gpt-4.1-nano to gpt-4.1-mini
examples/basic/hello_world.ts	Updated model references from gpt-4.1-nano to gpt-4.1-mini
examples/basic/agents_sdk.ts	Updated model reference from gpt-4.1-nano-2025-04-14 to gpt-4.1-mini-2025-04-14
docs/ref/checks/prompt_injection_detection.md	Removed benchmark data rows for gpt-5-nano and gpt-4.1-nano models
docs/ref/checks/nsfw.md	Removed benchmark data rows for gpt-5-nano and gpt-4.1-nano models
docs/ref/checks/jailbreak.md	Removed benchmark data rows for gpt-5-nano and gpt-4.1-nano models
docs/ref/checks/hallucination_detection.md	Removed benchmark data for nano variants and updated commentary to recommend gpt-4.1-mini for best latency
docs/evals.md	Updated benchmark example command to replace gpt-5-nano with gpt-4.1-mini

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[gabor-openai]

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