Octopus 83039fa22c
fix: use SystemMessage+HumanMessage for follow-up question generation (#1751)
* fix: use SystemMessage+HumanMessage for follow-up question generation (fixes #1697)

Some models (e.g. MiniMax-M2.7) require the system prompt and user
content to be passed as separate message objects rather than a single
combined string. Invoking with a plain string sends everything as a
HumanMessage, which causes these models to ignore the generation
instructions and fail to produce valid follow-up questions.

* test: verify model is invoked with SystemMessage and HumanMessage
2026-04-03 20:09:01 +08:00
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