feat: add MiniMax-M2.7 model to MiniMax provider

[roomote-v0]

This PR attempts to address Issue #11953.

Changes

• Added MiniMax-M2.7 model entry to packages/types/src/providers/minimax.ts with:
  • Context window: 204,800 tokens
  • Max tokens: 16,384
  • Input price: $0.3/M tokens
  • Output price: $1.2/M tokens
  • Cache writes price: $0.375/M tokens
  • Cache reads price: $0.06/M tokens
  • Prompt caching support enabled
  • Tool configuration consistent with other MiniMax models (search_and_replace included, apply_diff excluded)
• Default model remains MiniMax-M2.5 as requested
• Added test coverage for the new model in src/api/providers/__tests__/minimax.spec.ts

All existing tests pass (26/26). Feedback and guidance are welcome.

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