[feat] [model] add MiniMax as LLM provider protocol

[octo-patch]

Summary

• Add MiniMax as the 10th LLM provider protocol in coze-loop model system
• MiniMax provides OpenAI-compatible API, integrated via existing eino-ext openai component with default base URL https://api.minimax.io/v1
• Supported models: MiniMax-M2.7, MiniMax-M2.5, MiniMax-M2.5-highspeed (up to 1M context)

Changes

Backend (Go)

• entity/manage.go: Add ProtocolMiniMax constant and ProtocolConfigMiniMax struct
• eino/init.go: Add miniMaxBuilder function using OpenAI-compatible eino-ext component
• kitex_gen manage.go: Add ProtocolMinimax constant

IDL

• manage.thrift: Add protocol_minimax and ProtocolConfigMiniMax struct

Frontend (TypeScript)

• manage.ts: Add protocol_minimax enum value and ProtocolConfigMiniMax interface

Test plan

• 10 unit tests for minimax builder (various configs, error cases, model variants)
• 1 factory integration test (eino_minimax case in TestFactoryImpl_CreateLLM)
• 3 integration tests with real MiniMax API (generate, highspeed, stream)
• All existing tests pass without regression