Contrail

Unit Test "EmailTest.test_invalid_values_check" is failing

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### Summary The unit test case "EmailTest.test_invalid_values_check" fails because the `not-found .fr` was registered a few weeks ago and doesn't throw a `ValueError` exception anymore. This affects the CI process....

This PR fixes https://github.com/python-restx/flask-restx/issues/602. Lint fix also included.

Question Classifier doesn't work completely with vLLM

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### Self Checks - [x] This is only for bug report, if you would like to ask a question, please head to [Discussions](https://github.com/langgenius/dify/discussions/categories/general). - [x] I have searched for existing...

fix: ensure proper conversation role alternation for vLLM

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# Summary This PR resolves an issue where the Question Classifier returned an error when working with vLLM models. Fixes #18810 # Screenshots | Before | After | |--------|-------| |...