feat: add MiniMax provider

[octo-patch]

Summary

Add MiniMax as a configurable provider for MiniMax-M3 and MiniMax-M2.7, with both OpenAI-compatible and Anthropic-compatible API support.

Changes

• Add MiniMax provider registration, configuration, environment variables, host detection, and forward-proxy routing.
• Support global and mainland China base URLs for both compatible API protocols.
• Route buffered and streamed responses through the codec matching the request protocol.
• Preserve text masking for multimodal MiniMax-M3 requests while leaving image and video payloads unchanged.
• Add MiniMax settings to the desktop UI and migrate existing provider configurations.
• Document the provider routes and regional endpoints, and add a minor changeset.
• Add provider, routing, authentication, request-capture, and streaming regression tests.

Testing

• make test-go
• make build-go
• go vet ./src/backend/providers ./src/backend/config ./src/backend/proxy
• npm run lint from src/frontend
• npm run type-check from src/frontend
• npx changeset status

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[Davidnet]

Hi @octo-patch would you mind taking a look CLA? Also would love to connect, would you have any email or contact for where we should talk?

[octo-patch]

I have read the CLA Document and I hereby sign the CLA

[github-actions]

Warning

This PR touches 3+ distinct areas of the codebase.

Consider splitting into smaller, focused PRs — each covering a single semantic type.
This makes reviews easier and keeps the git history clean.

Categories found:

docs:

• .changeset/minimax-provider.md
• docs/01-getting-started.md
• docs/02-development-guide.md

code:

• src/backend/config/config.development.json
• src/backend/config/config.go
• src/backend/main.go
• src/backend/providers/anthropic.go
• src/backend/providers/minimax.go
• src/backend/providers/openai.go
• src/backend/providers/provider.go
• src/backend/proxy/handler.go
• src/backend/proxy/streaming.go
• src/backend/proxy/transparent.go
• src/frontend/src/components/privacy-proxy-ui.tsx
• src/frontend/src/components/settings/ProvidersSection.tsx
• src/frontend/src/electron/electron-main.js
• src/frontend/src/electron/electron.d.ts
• src/frontend/src/electron/ipc-handlers.js
• src/frontend/src/hooks/useElectronSettings.ts
• src/frontend/src/types/provider.ts
• src/frontend/src/utils/providerHelpers.ts

other:

• env.example

test:

• src/backend/config/config_test.go
• src/backend/main_test.go
• src/backend/providers/minimax_test.go
• src/backend/providers/providers_test.go
• src/backend/proxy/handler_test.go
• src/backend/proxy/streaming_test.go

[octo-patch]

Thanks for the review. The CLA check is now passing, and I pushed the MiniMax protocol routing, endpoint documentation, and regression tests. I ran the full Go test suite and build, Go vet for the affected packages, and the frontend lint and type checks.

[hanneshapke]

Hi @octo-patch - thank you for your submission. Are you a Kiji Proxy user?
Looks like you create numerous PRs to integrate MiniMax in open source applications, but are you using those applications?

[octo-patch]

Thanks for asking. I'm not currently an active Kiji Proxy user; this contribution was prepared by the Octopatch automation account after validating Kiji Proxy's existing extension points and tests. I understand if that does not fit the project's contribution scope.