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a037414985
* feat(deepseek): add native support for thinking and reasoning_effort params
Add proper parameter mapping for DeepSeek thinking mode, allowing users
to use the unified LiteLLM interface instead of extra_body workarounds.
Supported formats:
- thinking={"type": "enabled"}
- thinking={"type": "enabled", "budget_tokens": X} (budget_tokens ignored)
- reasoning_effort="low|medium|high" (maps to thinking enabled)
DeepSeek only supports {"type": "enabled"} without budget_tokens,
so any budget_tokens are stripped and all reasoning_effort values
(except "none") map to enabled.
Reference: https://api-docs.deepseek.com/guides/thinking_mode
* docs(deepseek): add thinking and reasoning_effort parameter documentation