Fix PolliLib timeouts respecting client configuration

[hackall360]

Summary

• update the JavaScript PolliLib base client to expose a reusable _resolveTimeout helper and ensure mixins honour caller-provided timeouts instead of hard-coded defaults
• mirror the timeout handling changes in the Python PolliLib client, including package entry points, so instance-level configuration is respected
• add regression tests in both JavaScript and Python that assert client-wide and per-request timeout overrides trigger aborts as expected

Testing

• node --test tests/test_*.js
• pytest tests
• npm run test

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https://chatgpt.com/codex/tasks/task_b_68d45a418d48832faefef0e150f87fde