Python: Add MiniMax AI connector for chat completion

[octo-patch]

Summary

• Add MiniMax AI connector for chat completion in the Python SDK
• MiniMax provides an OpenAI-compatible API (https://api.minimax.io/v1), so the connector follows the same pattern as the NVIDIA connector using AsyncOpenAI client
• Includes settings, prompt execution settings, chat completion service with streaming support, and comprehensive unit tests

Details

New files

• python/semantic_kernel/connectors/ai/minimax/ - Full connector implementation
  • settings/minimax_settings.py - Configuration via MINIMAX_API_KEY, MINIMAX_BASE_URL, MINIMAX_CHAT_MODEL_ID env vars
  • prompt_execution_settings/minimax_prompt_execution_settings.py - MiniMax-specific settings (temperature constrained to (0.0, 1.0])
  • services/minimax_chat_completion.py - Chat completion with streaming support
  • services/minimax_handler.py - Base handler for API communication
  • README.md - Quick-start guide

Modified files

• python/semantic_kernel/connectors/ai/README.md - Added MiniMax to connector table

Tests

• python/tests/unit/connectors/ai/minimax/ - Unit tests for settings, prompt execution settings, and chat completion (16 tests, all passing)

Supported Models

Model	Context Window
MiniMax-M2.5	204K
MiniMax-M2.5-highspeed	204K

Motivation

MiniMax is a growing AI provider with OpenAI-compatible APIs. Adding this connector allows Semantic Kernel users to easily integrate MiniMax models into their applications.

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