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

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Co-Authored-By: Claude <noreply@anthropic.com>

Author: jaggederest