fix(models): registry audit: new Together/Fireworks/Gemini/Mistral/xAI models, xai retirement repricing, bedrock grok-4.6 caching, deprecation dates - #38804

fix(models): registry audit: new Together/Fireworks/Gemini/Mistral/xAI models, xai retirement repricing, bedrock grok-4.6 caching, deprecation dates#38804

mateo-berri merged 10 commits into

litellm_internal_stagingBerriAI/litellm:litellm_internal_stagingfrom

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