Fix Anthropic provider ignoring the randomness (temperature) setting

[Montana]

AnthropicSource never passed the user's randomness setting to the Anthropic API in completion() or chatCompletion(), so the randomness slider had no effect for Anthropic models and requests always used the API default temperature.

All other providers already map randomness to temperature (OpenAI, Gemini, Bedrock, Azure OpenAI). PALM constrains randomness to 0-1, which matches Anthropic's supported temperature range, so the value can be passed through directly.

Description

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