Summary

• Stop pausing the Weixin polling loop for 10 minutes when iLink reports an expired session.
• Surface the expired-session state through the adapter fatal-error path so the gateway can report that QR login is required.
• Add regression coverage for the expired-session polling response.

Root cause

The Weixin poll loop handled iLink session expiration by sleeping for 10 minutes and then retrying the same expired credentials. That kept the adapter in a connected-looking state without making progress or clearly reporting the required re-authentication step.

Changes

• Convert iLink -14 responses from getUpdates into a non-retryable weixin_session_expired fatal error.
• Notify the gateway fatal-error handler immediately instead of sleeping in the poll loop.
• Cover the behavior with a poll-loop test that ensures no long pause is scheduled.

Validation

• .\venv\Scripts\python.exe -m pytest tests\gateway\test_weixin.py::TestWeixinPollLoop::test_session_expiry_reports_fatal_error_without_long_pause -q -n0
• .\venv\Scripts\python.exe -m pytest tests\gateway\test_weixin.py -q -n0
• .\venv\Scripts\python.exe -m py_compile gateway\platforms\weixin.py tests\gateway\test_weixin.py
• git diff --check

Fixes #12154