feat(deepinfra): update model YAMLs [bot]

[harshiv-26]

Auto-generated by poc-agent for provider deepinfra.

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Note

Low Risk
Low risk config-only change: updates model capability metadata and modalities without touching runtime code paths.

Overview
Updates DeepInfra Gemma model YAMLs to reflect chat support and expanded capabilities.

Both gemma-4-26B-A4B-it and gemma-4-31B-it now advertise function_calling and json_output, define explicit text input/output modalities, and add DeepInfra source URLs; gemma-4-31B-it is also marked status: active.

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