docs: publish Gemini native image references

[sam2tom]

Summary

• add Official Native API pages for Nano Banana Pro and Nano Banana 2
• document native GenerateContent passthrough and routing boundaries
• clarify that Gemini Interactions supports mapped Omni models, not every google/* model
• add navigation and regression coverage

Validation

• npm run validate
• npm run test:doc-content
• npm run test:public-api
• npm run test:links
• npm run build
• npm run test:built-public-api

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-08-31T10:17:51.998728Z	91f0fe2	PR opened

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 91f0fe2a5d

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[chatgpt-codex-connector]

Use camelCase for Gemini response media fields

Clients following this response example will look for inline_data.mime_type, but GenerateContent JSON uses inlineData.mimeType, as shown by the request on this page, the companion Gemini 3 Pro Image response, and the shared OpenAPI schema. Since this page documents native Gemini passthrough, use the actual camelCase response keys so copied parsing code can find and decode the returned image.

Useful? React with 👍 / 👎.