feat: add MiniMax TTS support

[Jackisome]

Summary

• Add MiniMax TTS support to unspeech backend (Go)
• Support both streaming and non-streaming TTS
• Add voice list API support via /api/voices?provider=minimax
• Add TypeScript SDK support via createUnMinimax()
• Fix Speed field type from int to float64 for better precision

Changes

File	Description
pkg/backend/minimax/speech.go	TTS implementation with streaming support
pkg/backend/minimax/voices.go	Voice list API implementation
pkg/backend/backend.go	Add minimax routing
pkg/backend/types/types.go	Fix Speed field type (int → float64)
sdk/typescript/src/backend/minimax.ts	TypeScript SDK
README.md	Add MiniMax to supported providers
sdk/typescript/README.md	Add MiniMax documentation

Test Plan

• Test TTS synthesis (non-streaming)
• Test streaming TTS
• Test voice list API (/api/voices?provider=minimax)
• Test with parameters (speed, emotion, vol, pitch, etc.)

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the unspeech backend by adding support for MiniMax TTS, offering both streaming and non-streaming capabilities. It includes necessary API endpoints, SDK integration, and a precision fix for the speed parameter, expanding the range of supported TTS providers.

Highlights

• MiniMax TTS Integration: This PR introduces MiniMax TTS support to the unspeech backend, enabling both streaming and non-streaming TTS functionalities.
• API and SDK Support: The changes include a voice list API via /api/voices?provider=minimax and TypeScript SDK support through createUnMinimax().
• Parameter Precision: The Speed field type was updated from int to float64 for improved precision in speech synthesis.

Changelog

• README.md
  • Updates the README to include MiniMax as a supported provider.
• pkg/backend/backend.go
  • Integrates MiniMax routing into the existing backend structure.
• pkg/backend/minimax/speech.go
  • Implements TTS functionality for MiniMax, supporting both streaming and non-streaming modes.
• pkg/backend/minimax/voices.go
  • Adds a voice list API endpoint specifically for MiniMax.
• pkg/backend/types/types.go
  • Modifies the Speed field type from int to float64 for better precision.
• sdk/typescript/README.md
  • Adds documentation for the MiniMax TypeScript SDK.
• sdk/typescript/src/backend/minimax.ts
  • Creates a TypeScript SDK for MiniMax TTS.

Activity

• Added MiniMax TTS support to the backend.
• Implemented streaming and non-streaming TTS.
• Added voice list API support.
• Added TypeScript SDK support.
• Fixed Speed field type for better precision.

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[gemini-code-assist]

Code Review

This pull request adds support for MiniMax TTS to the unSpeech backend and TypeScript SDK. While it introduces new Go backend files for speech synthesis and voice listing, updates to routing, and a corresponding TypeScript SDK module, two medium-severity issues have been identified: a logic bug in the TypeScript SDK causing permanent mutation of the base URL, and a memory exhaustion vulnerability in the streaming TTS implementation due to buffering the entire response. Additionally, the review highlights opportunities to improve code quality by addressing duplication in request building, enhancing readability by replacing nested ternary operators, using idiomatic Go for error and stream handling, and translating Chinese code comments to English for consistency.

[Jackisome]

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本地测试结果 ✅

已使用 TypeScript SDK 在本地完成测试验证：

测试环境

• Base URL: http://localhost:5933/
• API: MiniMax TTS (speech-2.8-turbo)

测试结果

1. 获取语音列表 ✅ - 成功获取 303 个语音
2. 基本语音合成 ✅ - 111,156 bytes
3. 带选项语音合成 ✅ - 78,324 bytes (支持 speed/vol/pitch/emotion)

所有测试通过，SDK 可正常使用。