feat(registry): add gemini-3.1-flash-image-preview model definition

[rex-zsd]

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[gemini-code-assist]

Summary of Changes

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This pull request introduces support for the new gemini-3.1-flash-image-preview model by registering its definition within the application's model registry. This ensures the application can correctly identify and interact with this specific Gemini model, enabling its use for content generation and other supported methods.

Highlights

• New Model Definition: Added the gemini-3.1-flash-image-preview model to the internal registry, including its ID, display name, version, token limits, and supported generation methods.

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Changelog

• internal/registry/model_definitions_static_data.go
  • Added the gemini-3.1-flash-image-preview model definition to the GetGeminiModels function.
  • Added the gemini-3.1-flash-image-preview model definition to the GetGeminiVertexModels function.

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[gemini-code-assist]

Code Review

This pull request adds the gemini-3.1-flash-image-preview model definition to the static data. The new model definition is duplicated across GetGeminiModels and GetGeminiVertexModels, which can cause maintenance issues. My feedback suggests refactoring to remove this duplication by using a shared variable for the model definition.