Add MiniMax as an alternative OpenAI-compatible provider

[octo-patch]

Summary

• Add MiniMax as an alternative OpenAI-compatible LLM provider for the course code samples
• MiniMax offers large-context models (up to 204K tokens) via an OpenAI-compatible API, making it a drop-in option with the existing OpenAIChatClient
• Update hotel_booking_workflow_sample.py to support automatic provider selection based on environment variables (MiniMax, GitHub Models, or OpenAI)

Changes

• .env.example: Add MINIMAX_API_KEY, MINIMAX_BASE_URL, and MINIMAX_MODEL_ID variables
• 00-course-setup/README.md: Add setup instructions for using MiniMax as an alternative provider
• 14-microsoft-agent-framework/README.md: Add MiniMax provider example in the agent creation section
• hotel_booking_workflow_sample.py: Implement provider selection logic that auto-detects MiniMax, GitHub Models, or OpenAI based on available environment variables
• README.md: Mention MiniMax as a supported alternative provider

Why MiniMax?

The Microsoft Agent Framework is designed to be provider-agnostic (as noted in Lesson 14's README). MiniMax's OpenAI-compatible API makes integration seamless — no additional SDK or dependencies required. This gives learners another option for running the course examples, especially useful for those who may not have Azure or GitHub Models access.

Test Plan

• Python syntax validation passes
• No breaking changes to existing provider configurations
• MiniMax provider is only activated when MINIMAX_API_KEY is set
• Existing GitHub Models and OpenAI paths remain unchanged

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