[Feat] Add GPT-5.6 Sol to Amazon Bedrock

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What changed

• Added OpenAI GPT-5.6 Sol to the Amazon Bedrock model catalog with its 1M context window, image support, and published geo inference pricing.
• Enabled the existing global inference option for GPT-5.6 Sol.
• Added regression tests for model metadata and the exact geo/global inference profile IDs required by Bedrock Runtime.

Why this change was made

Zoo Code's Bedrock provider already uses the Converse API supported by GPT-5.6 Sol, but the model was absent from the shared catalog. Selecting its model ID manually therefore fell back to unrelated default Claude metadata, and the model was unavailable in provider settings.

Closes #1572.

Impact

Users can select GPT-5.6 Sol in Amazon Bedrock settings and route requests through us.openai.gpt-5.6-sol or global.openai.gpt-5.6-sol using the existing inference controls. No documentation update is required because the model picker and controls are generated from the shared catalog.

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Review status

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✅ All modified and coverable lines are covered by tests.

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