feat: add MiniMax as alternative LLM provider (M2.7 default)

[octo-patch]

Summary

• Add MiniMax as an alternative LLM provider via @ai-sdk/openai OpenAI-compatible adapter
• Default model: MiniMax-M2.7 (latest flagship with enhanced reasoning and coding)
• Also supports: MiniMax-M2.7-highspeed, MiniMax-M2.5, MiniMax-M2.5-highspeed

Changes

• apps/web/lib/ai-provider.ts: Provider factory with MiniMax priority, temperature clamping
• apps/web/app/api/generate/route.ts: Updated API key check
• apps/web/.env.example: MiniMax configuration docs
• README.md: Updated setup instructions and tech stack
• apps/web/__tests__/ai-provider.test.ts: 11 unit tests
• apps/web/__tests__/ai-provider.integration.test.ts: 4 integration tests (M2.7, M2.7-highspeed, M2.5 legacy, streaming)

Why

MiniMax-M2.7 is the latest flagship model with enhanced reasoning and coding capabilities. The OpenAI-compatible API allows reuse of existing @ai-sdk/openai without new dependencies.

Testing

• All 11 unit tests passing
• All 4 integration tests passing with live MiniMax API

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