sdk: restore interrupt flag in sync polling

[chayu163]

What changed

• In syncPollResult, replace the ignored InterruptedException handler with Thread.currentThread().interrupt()
  followed by throwing ApiException.
• Normal (non-interrupted) polling path is unchanged.

Fixes #25

[zsphere-opensource]

Thanks for reporting this and submitting the fix!
Restoring the interrupt flag and propagating the interruption as an ApiException looks appropriate here, allowing synchronous polling to stop when interrupted.
We’ll review and validate this through our internal GitLab workflow, checking that interruption stops polling promptly, preserves the interrupt status, and leaves normal polling behavior unchanged.
Once accepted internally and synchronized to GitHub, we’ll share the public commit link here and preserve your authorship. If the PR is not automatically marked as merged, we’ll close it with the merged-internal label.