[feat] [model] add MiniMax as LLM provider protocol (M3 default)

[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-M3 (default, 512K context / 128K output, image input), MiniMax-M2.7, MiniMax-M2.7-highspeed

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 — default model MiniMax-M3)
• 1 factory integration test (eino_minimax case in TestFactoryImpl_CreateLLM)
• 3 integration tests with real MiniMax API (M3 generate, M2.7-highspeed generate, M3 stream)
• All existing tests pass without regression