Add regression tests for the non-streaming (_parse dict branch) and
streaming (_parse_chunks dict and SDK-object branches) paths that extract
reasoning_content, ensuring the field is populated when present and None
when absent.
Signed-off-by: Lingao Meng <menglingao@xiaomi.com>
Extract reasoning_content from both non-streaming and streaming responses
in OpenAICompatProvider. Accumulate chunks during streaming and merge into
LLMResponse, enabling reasoning chain display for models like MiMo and DeepSeek-R1.
Signed-off-by: Lingao Meng <menglingao@xiaomi.com>
Register xiaomi_mimo as an OpenAI-compatible provider with its API base URL,
add xiaomi_mimo to the provider config schema, and document it in README.
Signed-off-by: Lingao Meng <menglingao@xiaomi.com>