Add Xiaomi MiMo models #80

Name of model: MiMo V2.5 Pro, MiMo V2.5, MiMo V2 Flash

Model creator: Xiaomi

Link to model: https://platform.xiaomimimo.com/

Additional context:

Previously this provider could be used via the "OpenAI Compatible" option with the base URL https://token-plan-sgp.xiaomimimo.com/v1, but it broke because MiMo's proxy rejects OpenAI-specific extensions that Zoo Code sends by default (strict: true on tool schemas, additionalProperties: false, parallel_tool_calls, stream_options). Additionally, MiMo requires reasoning_content to be echoed back in multi-turn tool calling conversations. Without it the API returns 400 "Param Incorrect".