Quick-answer (RAG) agents can now configure a separate chat model for
the query-understanding stage (rewrite + intent classification),
decoupling it from the main conversation model so users can route the
lightweight rewrite call to a cheaper / faster model.
- Add CustomAgentConfig.QueryUnderstandModelID and plumb it through
PipelineRequest and ChatManage.Clone.
- query_understand plugin prefers QueryUnderstandModelID on the
text-only path; falls back to ChatModelID if the configured model
cannot be resolved (with a warn log). Multimodal path is unchanged
to keep vision-capable model selection intact.
- AgentEditorModal exposes a ModelSelector under the existing Query
Rewrite block; empty means reuse the main chat model.
- Add i18n strings (queryUnderstandModel / placeholder / desc) for
zh-CN, en-US, ko-KR, ru-RU.
- Extend Go SDK AgentConfig with the new field.
wizardchen
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