Add LLM subscription client methods

[neubig]

Summary

• add typed response models for LLM subscription auth endpoints
• add OpenAI subscription status, model list, device start/poll, and logout helpers to LLMMetadataClient
• cover endpoint paths and token non-exposure in API client tests

Tests

• npm test -- --runTestsByPath src/tests/api-clients.test.ts --runInBand
• npm run build

This PR was created by an AI agent (OpenHands) on behalf of the user.

[all-hands-bot]

🟡 Acceptable - Implementation is clean and follows existing patterns, but has missing test coverage and type inconsistencies that should be addressed.

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[all-hands-bot]

🟡 Acceptable - Implementation is clean and follows existing patterns. Previous test coverage gap has been addressed. One minor type consistency issue remains.

[TESTING COVERAGE]
✅ All 5 methods now have test coverage (getOpenAISubscriptionModels test added)
✅ Token non-exposure verified
✅ Endpoint paths verified

[RISK ASSESSMENT]

• [Overall PR] ⚠️ Risk Assessment: 🟢 LOW

Adding new client methods to existing LLMMetadataClient with comprehensive test coverage. No breaking changes to existing functionality. Standard CRUD operations following established patterns.

VERDICT:
✅ Worth merging: Core implementation is solid, test coverage complete, only minor type style improvement suggested

KEY INSIGHT:
Previous review feedback has been addressed - missing test coverage added and type definitions improved from number | string | null to number | null.

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Workflow run: https://github.com/OpenHands/typescript-client/actions/runs/26410852540

[neubig]

Updated the TypeScript client branch through b025805: merged current main, kept subscription client methods/tests green, and resolved the prior review threads. This remains the temporary git pin used by agent-canvas until this PR is merged and released.\n\nThis comment was generated by an AI agent (OpenHands) on behalf of neubig.

[neubig]

CI is green on b025805, all review threads are resolved, and this PR is ready for another review/merge gate pass.\n\nThis comment was generated by an AI agent (OpenHands) on behalf of neubig.