Summary

Adds MiniMax as a first-class LLM provider in TensorZero, alongside existing providers like OpenAI, Anthropic, DeepSeek, etc.

MiniMax offers an OpenAI-compatible chat completions API with models like MiniMax-M2.7 (1M context window). This PR adds native provider support so users can configure MiniMax models directly:

# Short-hand usage
model = "minimax::MiniMax-M2.7"

# Advanced configuration
[models.minimax_m27.providers.minimax]
type = "minimax"
model_name = "MiniMax-M2.7"

Changes

Rust Implementation (7 files, ~1100 additions)

• crates/tensorzero-types-providers/src/minimax.rs: Serde types for MiniMax API responses (reuses OpenAI-compatible types)
• crates/tensorzero-core/src/providers/minimax.rs: Full provider implementation:
  • MiniMaxCredentials with Static/Dynamic/WithFallback/None variants
  • MiniMaxProvider implementing InferenceProvider trait
  • Non-streaming and streaming inference
  • Tool use, JSON mode (with strict→normal downgrade), stop sequences
  • Proper error handling via handle_openai_error
  • Unit tests for request building, response parsing, credentials
• model.rs: ProviderConfig::MiniMax variant in all match arms (infer, infer_stream, batch, thought_block, supports_provider_tools, shorthand)
• model_table.rs: ProviderType::MiniMax, MiniMaxKind with ProviderKind impl, default credentials
• config/provider_types.rs: MiniMaxProviderTypeConfig with MINIMAX_API_KEY env default
• providers/mod.rs and types-providers/src/lib.rs: Module declarations

Documentation (10 files, ~260 additions)

• New: docs/integrations/model-providers/minimax.mdx - Getting started guide with simple and advanced setup
• Updated: README.md, docs.json, configuration-reference.mdx, API reference docs, gateway index, deployment guide, credentials management - all updated to include MiniMax in provider lists

Features

Test Plan

• Unit tests included for request construction, response parsing, credential handling, inference params
• CI compilation and clippy checks
• Integration tests with live MiniMax API (requires MINIMAX_API_KEY)