test: add comprehensive tests for api.ts functions

- Add tests for needToken() function covering all TLS configuration scenarios
- Add tests for createHttpAgent() including TLS, proxy, and insecure mode
- Add tests for startWorkspaceIfStoppedOrFailed() with process spawn mocking
- Refactor api.ts to eliminate config access duplication with getConfigString/getConfigPath helpers
- Total test count increased from 59 to 82 tests

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: jaggederest